Venomous Shrew And Lizard: Harmless Digestive Enzyme Evolved Twice Into Dangerous Toxin In Two Unrelated Species

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A harmless digestive enzyme can be turned into a toxin in two unrelated species — a shrew (pictured) and a lizard — thereby giving each a venomous bite.

Biologists have shown that independent but similar molecular changes turned a harmless digestive enzyme into a toxin in two unrelated species — a shrew and a lizard — giving each a venomous bite.

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