Sulfide concentration in blood. (A) Sulfide concentration in blood. p-value: *<0.05, **<0.01, ***<0.001, ns – not significant (Kruskal Wallies test followed by Nemenyi test). (B) Corellation between maximum longevity residual and mean sulfide concentration in blood. In (A) and (B) Hgl – H. glaber, Fmi – F. micklemi, Fme – F. mechowii, Cpo – C. porcellus, Mmu – M. musculus, Hsa – H. sapiens.