Envelysin (, sea-urchin-hatching proteinase, hatching enzyme, chorionase, chorion-digesting proteinase, chymostrypsin, sea urchin embryo hatching enzyme) is an enzyme. This enzyme catalyses the following chemical reaction
Hydrolysis of proteins of the fertilization envelope and dimethylcasein
This enzyme is a glycoprotein from various members of the class Echinoidea.
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