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: any of several intracellular proteases that have a cysteine residue at their active site, that cleave substrate proteins at specific aspartic acid residues, and that are involved in the initiation and mediation of apoptosis
… the mitochondria either rupture or leak, ensuring their own demise and releasing a cocktail of factors that trigger protein-splitting enzymes called caspases. The activated caspases then rapidly cleave proteins in the cell's internal skeleton, membranes, and nucleus to bring about the characteristic hallmarks of apoptosis.—
Elizabeth Finkel, Science
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Merriam-Webster unabridged
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