A toxic protein produced by the castor bean plant (Ricinus communis), used historically in medical research.
From 'Croton' (genus name of the castor bean plant) combined with the protein suffix '-in.' Named after the ancient Greek region where similar plants grew.
Crotin is how scientists first understood toxins at the molecular level—it was one of the earliest proteins completely sequenced, making it a gateway to understanding how poisons actually work at a chemical level!
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