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From defense to attack molecules
View Larger Version | Some proteins in venomous creatures evolved into toxins when certain genes were duplicated. A family of molecules called beta-defensins - immune system heroes that help fight off disease-causing invaders by chopping up proteins - were repurposed as toxins in lizards and snakes (lineage shown in blue) and, independently, in platypuses (molecular lineage shown in red).
Credit: W. Warren et al./Nature 2008
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