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Cellular proliferation/viability assay (MTT [3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide]). Colorimetric MTT assay indicating cystathionine γ-lyase (CSE)-wild-type (WT) and CSE-knockout (KO) smooth muscle cell proliferation at 12 h hypoxia. *P<0.05; **P<0.01; ***P<0.001. a.u. Arbitrary units
