“…In recent years much attention has been focussed on elucidating the functional roles of the gaseous mediator hydrogen sulfide (H 2 S) in biological systems (for reviews see, Guo, Cheng, & Zhu, 2013;Li, Rose, & Moore, 2011;Olas, 2014;Wang, 2012). It is now clear that biologically active quantities of H 2 S are synthesized naturally by a number of cell types in a range of different tissues in mammals, nonmammalian species, and even plants.…”