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(A) Effect of l-PAG, at concentrations from 0 to 100 µM, on H2S production in an in vitro assay using mouse liver homogenates. (B) Effect of l-PAG (30 µM) on H2S generation by CSE and CBS in mouse liver homogenates. Data are presented as mean ± SEM from four independent experiments. **P < 0.01; ns, not significant.
