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. Author manuscript; available in PMC: 2014 Jul 1.
Published in final edited form as: Free Radic Biol Med. 2013 Mar 1;60:195–200. doi: 10.1016/j.freeradbiomed.2013.02.024

Figure 1. Various biochemical forms of H2S bioavailability.

Figure 1

H2S exists in different biochemical forms within biological systems that can be classified based on chemical properties and/or structure. Freely available H2S represents gaseous H2S and its HS− anion, acid labile sulfide represents iron-sulfur clusters and persulfides, and bound sulfane sulfur represents thiol sulfides, polysulfides, sulfate/sulfite, and bound elemental sulfur.