Displaying publications 1661 - 1680 of 3311 in total

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  1. Aqueous extract of Centella asiatica promotes corneal epithelium wound healing in vitro
    Ruszymah BH, Chowdhury SR, Manan NA, Fong OS, Adenan MI, Saim AB
    J Ethnopharmacol, 2012 Mar 27;140(2):333-8.
    PMID: 22301444 DOI: 10.1016/j.jep.2012.01.023
    Centella asiatica is a traditional herbal medicine that has been shown to have pharmacological effect on skin wound healing, and could be potential therapeutic agent for corneal epithelial wound healing.
    Matched MeSH terms: Epithelial Cells/drug effects*
  2. Flavonoids with antiplasmodial and cytotoxic activities of Macaranga triloba
    Zakaria I, Ahmat N, Jaafar FM, Widyawaruyanti A
    Fitoterapia, 2012 Jul;83(5):968-72.
    PMID: 22561914 DOI: 10.1016/j.fitote.2012.04.020
    A new flavanone derivative, malaysianone A (1), four prenylated flavanones, 6-prenyl-3'-methoxyeriodictyol (2), nymphaeol B (3), nymphaeol C (4) and 6-farnesyl-3',4',5,7-tetrahydroxyflavanone (5), and two coumarins, 5,7-dihydroxycoumarin (6) and scopoletin (7), were isolated from the dichloromethane extract of the inflorescences of Macaranga triloba. The structures of these compounds were elucidated based on spectroscopic methods including nuclear magnetic resonance (NMR-1D and 2D), UV, IR and mass spectrometry. The cytotoxic activity of the compounds was tested against several cell lines, with 5 inhibiting very strongly the growth of HeLa and HL-60 cells (IC(50): 1.3 μg/ml and 3.3 μg/ml, respectively). Compound 5 also showed strong antiplasmodial activity (IC(50): 0.06 μM).
    Matched MeSH terms: HeLa Cells; HL-60 Cells
  3. Biosorption of copper and zinc by immobilised and free algal biomass, and the effects of metal biosorption on the growth and cellular structure of Chlorella sp. and Chlamydomonas sp. isolated from rivers in Penang, Malaysia
    Maznah WO, Al-Fawwaz AT, Surif M
    J Environ Sci (China), 2012;24(8):1386-93.
    PMID: 23513679
    In this study, the biosorption of copper and zinc ions by Chlorella sp. and Chlamydomonas sp. isolated from local environments in Malaysia was investigated in a batch system and by microscopic analyses. Under optimal biosorption conditions, the biosorption capacity of Chlorella sp. for copper and zinc ions was 33.4 and 28.5 mg/g, respectively, after 6 hr of biosorption in an immobilised system. Batch experiments showed that the biosorption capacity of algal biomass immobilised in the form of sodium alginate beads was higher than that of the free biomass. Scanning electron microscopy and energy-dispersive X-ray spectroscopy analyses revealed that copper and zinc were mainly sorbed at the cell surface during biosorption. Exposure to 5 mg/L of copper and zinc affected both the chlorophyll content and cell count of the algal cells after the first 12 hr of contact time.
    Matched MeSH terms: Cells, Immobilized/chemistry
  4. Development of a novel model for the investigation of implant-soft tissue interface
    Chai WL, Moharamzadeh K, Brook IM, Emanuelsson L, Palmquist A, van Noort R
    J. Periodontol., 2010 Aug;81(8):1187-95.
    PMID: 20450401 DOI: 10.1902/jop.2010.090648
    In dental implant treatment, the long-term prognosis is dependent on the biologic seal formed by the soft tissue around the implant. The in vitro investigation of the implant-soft tissue interface is usually carried out using a monolayer cell-culture model that lacks a polarized-cell phenotype. This study developed a tissue-engineered three-dimensional oral mucosal model (3D OMM) to investigate the implant-soft tissue interface.
    Matched MeSH terms: Epithelial Cells/cytology
  5. Fulltext Juvenile myelomonocytic leukaemia: a case series
    Azma RZ, Zarina AL, Hamidah A, Jamal R, Sharifah NA, Ainoon O, et al.
    Malays J Pathol, 2009 Dec;31(2):121-8.
    PMID: 20514855 MyJurnal
    Juvenile myelomonocytic leukaemia (JMML), previously known as juvenile chronic myeloid leukaemia (JCML) is a rare, myelodysplastic - myeloproliferative disease typically presenting in early childhood. This disorder is difficult to distinguish from other myeloproliferative syndrome such as chronic myeloid leukaemia (CML) because of the similarities in their clinical and bone marrow findings. However, because of its unique biological characteristics such as absolute monocytosis with dysplasia, absence of Philadelphia chromosome or BCR-ABL fusion protein, hypergammaglobulinaemia and raised fetal haemoglobin level, this disorder does not satisfy the criteria for inclusion in the CML or chronic myelomonocytic leukaemia (CMML) group, as seen in adult patients. We describe a series of three patients with JMML, who had almost similar clinical and laboratory findings, and discuss the difficulty in the classification and treatment of the disease.
    Matched MeSH terms: Bone Marrow Cells/pathology*
  6. Suppression of tumor growth by palm tocotrienols via the attenuation of angiogenesis
    Weng-Yew W, Selvaduray KR, Ming CH, Nesaretnam K
    Nutr Cancer, 2009;61(3):367-73.
    PMID: 19373610 DOI: 10.1080/01635580802582736
    Previous studies have revealed that tocotrienol-rich fractions (TRF) from palm oil inhibit the proliferation and the growth of solid tumors. The anticancer activity of TRF is said to be caused by several mechanisms, one of which is antiangiogenesis. In this study, we looked at the antiangiogenic effects of TRF. In vitro investigations of the antiangiogenic activities of TRF, delta-tocotrienol (deltaT3), and alpha-tocopherol (alphaToc) were carried out in human umbilical vein endothelial cells (HUVEC). TRF and deltaT3 significantly inhibited cell proliferation from 4 microg/ml onward (P < 0.05). Cell migration was inhibited the most by deltaT3 at 12 microg/ml. Anti-angiogenic properties of TRF were carried out further in vivo using the chick embryo chorioallantoic membrane (CAM) assay and BALB/c mice model. TRF at 200 microg/ml reduced the vascular network on CAM. TRF treatment of 1 mg/mouse significantly reduced 4T1 tumor volume in BALB/c mice. TRF significantly reduced serum vascular endothelial growth factor (VEGF) level in BALB/c mice. In conclusion, this study showed that palm tocotrienols exhibit anti-angiogenic properties that may assist in tumor regression.
    Matched MeSH terms: Endothelial Cells/drug effects
  7. New species of Cryptosporidium Tyzzer, 1907 (Apicomplexa) from amphibian host: morphology, biology and phylogeny
    Jirků M, Valigurová A, Koudela B, Krízek J, Modrý D, Slapeta J
    Folia Parasitol., 2008 Jun;55(2):81-94.
    PMID: 18666410
    Cryptosporidium fragile sp. n. (Apicomplexa) is described from black-spined toads, Duttaphrynus melanostictus (Schneider) (Amphibia, Anura, Bufonidae) from the Malay Peninsula. The parasitized animals were directly imported from Malaysia and harboured C. fragile at the time of arrival. Oocysts were subspherical to elliptical with irregular contour in optical section, measuring 6.2 (5.5-7.0) x 5.5 (5.0-6.5) microm. Oocyst wall was smooth and colourless in light microscopy. The endogenous development of C. fragile in the stomach of black-spined toad was analysed in detail using light and electron microscopy. Cryptosporidian developmental stages were confined to the surface of gastric epithelial cells. In transmission experiments, C. fragile has not been infective for one fish species, four amphibian species, one species of reptile and SCID mice. Full length small subunit rRNA gene sequence was obtained. Phylogenetic reconstruction revealed distinct status of C. fragile within the clade of species with gastric localisation including Cryptosporidium muris Tyzzer, 1907, Cryptosporidium serpentis Levine, 1980 and Cryptosporidium andersoni Lindsay, Upton, Owens, Morgan, Mead et Blagburn, 2000. Described characteristics differentiate C. fragile from the currently recognized Cryptosporidium species. Our experience with the description of C. fragile has led us to revise the recommended criteria for an introduction of a new Cryptosporidium species name. C. fragile is the first species described and named from an amphibian host. Its prevalence of 83% (15/18) in black-spined toads within the 3 months after importation calls for strict quarantine measures and import regulation for lower vertebrates.
    Matched MeSH terms: Epithelial Cells/parasitology
  8. A cycloartane incorporating a fused tetrahydrofuran ring and a cytotoxic lactam from Monocarpia marginalis
    Lim SH, Mahmood K, Komiyama K, Kam TS
    J Nat Prod, 2008 Jun;71(6):1104-6.
    PMID: 18462006 DOI: 10.1021/np800123g
    A new cycloartane, monocarpinine (1), incorporating a fused tetrahydrofuranyl ring, and a cytotoxic tetracyclic lactam, monomarginine (2), were isolated from a stem bark extract of the Malayan species Monocarpia marginalis. The structures of these compounds were determined using NMR and MS analysis. Monomarginine (2) showed appreciable cytotoxicity toward human KB (both drug-sensitive and drug-resistant) and Jurkat cells.
    Matched MeSH terms: KB Cells; Jurkat Cells
  9. Isolation of purified autologous peripheral blood CD34+ cells with low T cell content using CliniMACS device--a local experience
    Leong CF, Habsah A, Teh HS, Goh KY, Fadilah SA, Cheong SK
    Malays J Pathol, 2008 Jun;30(1):31-6.
    PMID: 19108409
    Peripheral blood stem cells (PBSC) mobilised with growth factor with or without chemotherapeutic regimens, are used increasingly in both autologous and allogeneic transplantation. Previously, many PBSC harvests are used directly without ex vivo manipulation, and these PBSC have been shown to be contaminated with tumour cells, which may contribute to subsequent relapses post transplantation. Therefore, requirement for purging of malignant cells from the harvest has initiated the use of various methods to reduce tumour cell contamination of the graft by the positive selection of CD34+ progenitor cells or negative selection of tumour cells using other cell-specific antigens. We report here our local experience with the CliniMACS (magnetic-activated cell separation system) in eight adult patients with haematologic malignancies.
    Matched MeSH terms: Hematopoietic Stem Cells/cytology*
  10. Giant cell myocarditis with cardiac tamponade: a rare combination
    Murty OP
    Am J Forensic Med Pathol, 2008 Sep;29(3):245-8.
    PMID: 18725781 DOI: 10.1097/PAF.0b013e318183d55f
    Giant cell myocarditis (GCM) is a rare but fatal disease of idiopathic origin. It results in focal necrosis of myocardium. This is a case report of middle aged Malaysian Indian female who died due to cardiac tamponade due to rupture myocardium and tear in the root of aorta. On naked eye examination, it simply resembled as recent as well as old fibrotic areas of myocardial infarction. She was clinically diagnosed as a case of obstructive cardiomyopathy with atrioventricular block, and was on pace maker. There was subendocardial fibrosis and left ventricular transmural infarction in the left ventricle. On histopathology, this was diagnosed as GCM, there were widespread areas of inflammatory cellular infiltration within the myocardium with multinucleated giant cells and granulomas interspersed with lymphocytes. Microscopic field showed up to 10 multinucleated giant cells. In this case, there were focal areas at multiple locations and caused uneven thickness in the left ventricle wall. Idiopathic GCM is very rare and causation of hemopericardium is the unique feature of this case. In this case the direct link of GCM with aortitis and rupture of left ventricle wall resulting in hemopericardium is shown. This case is documented through macroscopic as well as microscopic photographs in H&E, Ziel-Nelson, and GMS staining.
    Matched MeSH terms: Giant Cells/pathology*
  11. Effect of colchicine on the murine immune response induced by Aggregatibacter actinomycetemcomitans
    Sosroseno W
    Biomed Pharmacother, 2009 Mar;63(3):221-7.
    PMID: 18534811 DOI: 10.1016/j.biopha.2008.04.004
    The aim of the present study was to test the hypothesis that colchicine may alter Aggregatibacter actinomycetemcomitans-induced immune response and abscess formation in mice. BALB/c mice were either sham-immunized or immunized with heat-killed A. actinomycetemcomitans. Spleen cells were stimulated with heat-killed A. actinomycetemcomitans in the presence or absence of colchicine. Specific IgG subclass antibodies, interferon-gamma (IFN-gamma), interleukin-4 (IL-4) and cell proliferation were determined. The animals were sham-immunized (group I) or immunized with heat-killed A. actinomycetemcomitans (groups II-VII). Colchicine was administered intraperitoneally before (group III), on the same day of (group IV), or after (group V) the primary immunization and on the same day of (group VI) or after (group VII) the secondary immunization. All groups were challenged with viable A. actinomycetemcomitans. The levels of serum-specific IgG subclasses and both IFN-gamma and IL-4 before and after bacterial challenge were assessed. The diameter of skin lesions was assessed. The results showed that colchicine augmented splenic-specific IgG1 and IL-4 as well as cell proliferation but suppressed specific IgG2a and IFN-gamma levels. Enhancement of serum-specific IgG1 and IL-4 levels, suppression of specific IgG2a and IFN-gamma levels as well as DTH response, and delayed healing of the lesions were observed in groups IV and VI, but not in the remaining groups of animals. Therefore, these results suggest that colchicine may induce a T helper 2 (Th2)-like immunity specific to A. actinomycetemcomitans in vitro and that colchicine administered on the same day as the immunization may stimulate a non-protective Th2-like immunity in A. actinomycetemcomitans-induced infections in mice.
    Matched MeSH terms: Th2 Cells/immunology*
  12. Relation of distortion product otoacoustic emission with tinnitus
    Ami M, Abdullah A, Awang MA, Liyab B, Saim L
    Laryngoscope, 2008 Apr;118(4):712-7.
    PMID: 18176342 DOI: 10.1097/MLG.0b013e318161e521
    To investigate cochlear outer hair cell function based on distortion product otoacoustic emission (DPOAE) in patients with tinnitus.
    Matched MeSH terms: Hair Cells, Auditory, Outer/physiology*
  13. Apoptosis induction, cell cycle arrest and in vitro anticancer activity of gonothalamin in a cancer cell lines
    Alabsi AM, Ali R, Ali AM, Al-Dubai SA, Harun H, Abu Kasim NH, et al.
    Asian Pac J Cancer Prev, 2012;13(10):5131-6.
    PMID: 23244123
    Cancer is one of the major health problems worldwide and its current treatments have a number of undesired adverse side effects. Natural compounds may reduce these. Currently, a few plant products are being used to treat cancer. In this study, goniothalamin, a natural occurring styryl-lactone extracted from Goniothalamus macrophyllus, was investigated for cytotoxic properties against cervical cancer (HeLa), breast carcinoma (MCF-7) and colon cancer (HT29) cells as well as normal mouse fibroblast (3T3) using MTT assay. Fluorescence microscopy showed that GTN is able to induce apoptosis in HeLa cells in a time dependent manner. Flow cytometry further revealed HeLa cells treated with GTN to be arrested in the S phase. Phosphatidyl serine properties present during apoptosis enable early detection of the apoptosis in the cells. Using annexin V/PI double staining it could be shown that GTN induces early apoptosis on HeLa cells after 24, 48 and 72 h. It could be concluded that goniothalamin showing a promising cytotoxicity effect against several cancer cell lines including cervical cancer cells (HeLa) with apoptosis as the mode of cell death induced on HeLa cells by Goniothalamin was.
    Matched MeSH terms: Cells, Cultured; HeLa Cells
  14. Fulltext Hippuric acid nanocomposite enhances doxorubicin and oxaliplatin-induced cytotoxicity in MDA-MB231, MCF-7 and Caco2 cell lines
    Hussein Al Ali SH, Al-Qubaisi M, Hussein MZ, Ismail M, Bullo S
    Drug Des Devel Ther, 2013;7:25-31.
    PMID: 23345969 DOI: 10.2147/DDDT.S37070
    The aim of the current study is to design a new nanocomposite for inducing cytotoxicity of doxorubicin and oxaliplatin toward MDA-MB231, MCF-7, and Caco2 cell lines. A hippuric acid (HA) zinc layered hydroxide (ZLH) nanocomposite was synthesized under an aqueous environment using HA and zinc oxide (ZnO) as the precursors.
    Matched MeSH terms: Caco-2 Cells; MCF-7 Cells
  15. Isolation and identification of antibacterial and cytotoxic compounds from the leaves of Muntingia calabura L
    Sufian AS, Ramasamy K, Ahmat N, Zakaria ZA, Yusof MI
    J Ethnopharmacol, 2013 Mar 7;146(1):198-204.
    PMID: 23276785 DOI: 10.1016/j.jep.2012.12.032
    Muntingia calabura (Elaeocarpaceae) is one of the most common roadside trees in Malaysia. Its leaves, barks, flowers and roots have been used as a folk remedy for the treatment of fever, incipient cold, liver disease, as well as an antiseptic agent in Southeast Asia. The aim of this study is to isolate and identify the antibacterial and cytotoxic compounds from the leaves of Muntingia calabura L.
    Matched MeSH terms: HL-60 Cells; MCF-7 Cells
  16. A negative waveform in the scotopic response in a patient with phosphoglycerate kinase deficiency: a visual electrophysiology report
    Mohd Khialdin S, Grigg J, Rowe N, Crofts S, Wilson M, Troedson C
    Documenta ophthalmologica. Advances in ophthalmology, 2015 Dec;131(3):215-20.
    PMID: 26396085 DOI: 10.1007/s10633-015-9511-0
    Phosphoglycerate kinase (PGK) deficiency is an X-linked neurometabolic genetic disorder with variable systemic manifestations. So far, only one patient with retinal anomalies has been reported, but no visual electrophysiology findings were described. We report the first description of visual electrophysiology in a child with PGK deficiency. This provides further information for the site of involvement in the eye.
    Matched MeSH terms: Photoreceptor Cells, Vertebrate/physiology*
  17. Fulltext Genetic Diversity and Natural Selection of the Plasmodium knowlesi Circumsporozoite Protein Nonrepeat Regions
    Fong MY, Ahmed MA, Wong SS, Lau YL, Sitam F
    PLoS One, 2015;10(9):e0137734.
    PMID: 26379157 DOI: 10.1371/journal.pone.0137734
    Plasmodium knowlesi is a simian malaria parasite that has been identified to cause malaria in humans. To date, several thousand cases of human knowlesi malaria have been reported around Southeast Asia. Thus far, there is no detailed study on genetic diversity and natural selection of P. knowlesi circumsporozoite protein (CSP), a prominent surface antigen on the sporozoite of the parasite. In the present study, the genetic diversity and natural selection acting on the nonrepeat regions of the gene encoding P. knowlesi CSP were investigated, focusing on the T-cell epitope regions at the C-terminal of the protein.
    Matched MeSH terms: Th2 Cells/immunology
  18. Non-Invasive DNA Sampling for Molecular Analysis of Beta-Thalassemia: Amiable Alternative Sampling Methods with Accurate Results for Pediatric Patients
    Abd Rahim MR, Kho SL, Kuppusamy UR, Tan JA
    Clin. Lab., 2015;61(9):1325-30.
    PMID: 26554253
    BACKGROUND: Beta-thalassemia is the most common genetic disorder in Malaysia. Confirmation of the β-globin gene mutations involved in thalassemia is usually carried out by molecular analysis of DNA extracted from leukocytes in whole blood. Molecular analysis is generally carried out when affected children are around 1 - 2 years as clinical symptoms are expressed during this period. Blood taking at this age can be distressing for the child. High yield and pure DNA extracted from non-invasive sampling methods can serve as alternative samples in molecular studies for genetic diseases especially in pediatric cases.

    METHODS: In this study, mouthwash, saliva, and buccal cytobrush samples were collected from β-thalassemia major patients who had previously been characterized using DNA extracted from peripheral blood. DNA was extracted from mouthwash, saliva, and buccal cytobrush samples using the conventional inexpensive phenol-chloroform method and was measured by spectrophotometry for yield and purity. Molecular characterization of β-globin gene mutations was carried out using the amplification refractory mutation system (ARMS).

    RESULTS: DNA extracted from mouthwash, saliva, and buccal cytobrush samples produced high concentration and pure DNA. The purified DNA was successfully amplified using ARMS. Results of the β-globin gene mutations using DNA from the three non-invasive samples were in 100% concordance with results from DNA extracted from peripheral blood.

    CONCLUSIONS: The conventional in-house developed methods for non-invasive sample collection and DNA extraction from these samples are effective and negate the use of more expensive commercial kits. In conclusion, DNA extracted from mouthwash, saliva, and buccal cytobrush samples provided sufficiently high amounts of pure DNA suitable for molecular analysis of β-thalassemia.

    Matched MeSH terms: Epithelial Cells/chemistry
  19. Fulltext Cycloart-24-ene-26-ol-3-one, a New Cycloartane Isolated from Leaves of Aglaia exima Triggers Tumour Necrosis Factor-Receptor 1-Mediated Caspase-Dependent Apoptosis in Colon Cancer Cell Line
    Leong KH, Looi CY, Loong XM, Cheah FK, Supratman U, Litaudon M, et al.
    PLoS One, 2016;11(4):e0152652.
    PMID: 27070314 DOI: 10.1371/journal.pone.0152652
    Plants in the Meliaceae family are known to possess interesting biological activities, such as antimalaral, antihypertensive and antitumour activities. Previously, our group reported the plant-derived compound cycloart-24-ene-26-ol-3-one isolated from the hexane extracts of Aglaia exima leaves, which shows cytotoxicity towards various cancer cell lines, in particular, colon cancer cell lines. In this report, we further demonstrate that cycloart-24-ene-26-ol-3-one, from here forth known as cycloartane, reduces the viability of the colon cancer cell lines HT-29 and CaCO-2 in a dose- and time-dependent manner. Further elucidation of the compound's mechanism showed that it binds to tumour necrosis factor-receptor 1 (TNF-R1) leading to the initiation of caspase-8 and, through the activation of Bid, in the activation of caspase-9. This activity causes a reduction in mitochondrial membrane potential (MMP) and the release of cytochrome-C. The activation of caspase-8 and -9 both act to commit the cancer cells to apoptosis through downstream caspase-3/7 activation, PARP cleavage and the lack of NFkB translocation into the nucleus. A molecular docking study showed that the cycloartane binds to the receptor through a hydrophobic interaction with cysteine-96 and hydrogen bonds with lysine-75 and -132. The results show that further development of the cycloartane as an anti-cancer drug is worthwhile.
    Matched MeSH terms: Caco-2 Cells; HT29 Cells
  20. SRJ09, a promising anticancer drug lead: Elucidation of mechanisms of antiproliferative and apoptogenic effects and assessment of in vivo antitumor efficacy
    Wong CC, Lim SH, Sagineedu SR, Lajis NH, Stanslas J
    Pharmacol Res, 2016 05;107:66-78.
    PMID: 26940565 DOI: 10.1016/j.phrs.2016.02.024
    SRJ09 (3,19-(2-bromobenzylidene)andrographolide), a semisynthetic andrographolide (AGP) derivative, was shown to induce G1 cell cycle arrest and eventually apoptosis in breast and colon cancer cell lines. The present investigation was carried out to elucidate the mechanisms cell cycle arrest and apoptosis and evaluate the in vivo antitumor activity of SRJ09. The in vitro growth inhibitory properties of compounds were assessed in colon (HCT-116) and breast (MCF-7) cancer cell lines. Immunoblotting was utilized to quantitate the protein levels in cells. The gene expressions were determined using reverse transcriptase PCR (RT-PCR). Pharmacokinetic investigation was carried out by determining SRJ09 levels in plasma of Balb/C mice using HPLC. In vivo antitumor activity was evaluated in athymic mice carrying HCT-116 colon tumor xenografts. SRJ09 displayed improved in vitro activity when compared with AGP by producing rapid cell killing effect in vitro. Its activity was not compromised in MES-SA/Dx5 multidrug resistant (MDR) cells expressing p-glycoprotein. Cells treated with SRJ09 (0.1-10μM) displayed increased p21 protein level, which corresponded with gene expression. Whereas CDK4 protein level and gene expression was suppressed. The treatment did not affect cyclin D1. Changes of these proteins paralleled G1 cell cycle arrest in both cell lines as determined by flow cytometry. Induction of apoptosis by SRJ09 in HCT-116 cells which occurred independent of p53 and bcl-2 was inhibited in the presence of caspase 8 inhibitor, implicating the extrinsic apoptotic pathway. A single dose (100mg/kg, i.p) of SRJ09 produced a plasma concentration range of 12-30.4μM. At 400mg/kg (q4dX3), it significantly retarded growth of tumor xenografts. The antitumor activity of SRJ09 is suggested mediated via the induction of p21 expression and suppression of CDK-4 expression without affecting cyclin D1 to trigger G1 arrest leading to apoptosis.
    Matched MeSH terms: HCT116 Cells; MCF-7 Cells
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