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Dose-dependent cytotoxicity of elapid and viperid venoms toward MCF-7 breast cancer cells. Note that for a and b, toxicity curves follow a standard dose-dependent decrease approximating 0 % survivorship, while c and d appear to reach a threshold beyond which no effects of increased venom concentrations are observed. Crotalus o. cerberus is the least toxic (LD50) subspecies in the oreganus clade, while C. o. concolor is the most toxic
