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Diurnal fluctuations of plasma H2S in mice. (A) H2S levels in plasma successively at 7:00 and 19:00 from the same mice. (B) H2S levels in plasma successively at 19:00 and 7:00 from the same mice. (C) H2S levels in plasma successively at 7:00 and 19:00 from the same mice exposed to continuous light for 24 h. Results are means ± SEM. A P of <0.05 was considered significant.
