What is "acrosin"

n. (context enzyme English) A proteolytic enzyme, found in the acrosome of spermatozoa, that enables penetration of the egg.

Acrosin is a digestive enzyme that acts as a protease. In humans, acrosin is encoded by the ACR gene. Acrosin is released from the acrosome of spermatozoa as a consequence of the acrosome reaction. It aids in the penetration of the Zona Pellucida.