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Horizontal red bar = mean value. Cva = Crotalus viridis abyssus; Ca = Crotalus adamanteus; Scc = Sistrurus catenatus catenatus; Cc = Crotalus cerastes; Sce = Sistrurus catenatus edwardsii; Ch = Crotalus horridus. See Table 1 for literature citations and test statistics.
