Many venom toxins can be cloned, created by molecular biological procedures, and manufactured by simple chemical synthesis. Venoms can be divided into groups: ion channel toxins, like those found in rattlesnakes, scorpions, and cone snail; presynaptic phospholipase A2 neurotoxins, found in the banded krait, Mojave rattler, and Australian taipan snake; postsynaptic neurotoxins, found in the coral, mamba, cobra, sea snake, and cone snail; membrane-damaging toxins of the Formosan cobra and rattlesnake; and the coagulation/anticoagulation toxins, found in the Malayan pit viper and carpet viper. Toxins are unlike chemical agents in that they vary widely in their mechanism of action. Time from exposure to onset of symptoms also varies widely