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Effect of L-Cth on caspase-9 activities in Hcy-treated HUVECs. (a) Quantitative analysis of caspase-9 activities measured with a caspase-9 activity colorimetric kit. (b) Caspase-9 activity detected with living cell caspase-9 Fluo-staining kit (magnification, ×600; scale bar: 20 μm). Data are presented as mean ± SEM. ∗∗P < 0.01 versus control group; ##P < 0.01 versus Hcy group. L-Cth: L-cystathionine.
