Sawada, H.; Yokosawa, H.; Ishii, S.
Purification and characterization of two types of trypsin-like enzymes from sperm of the ascidian (Prochordata) Halocynthia roretzi. Evidence for the presence of spermosin, a novel acrosin-like enzyme (1984), J. Biol. Chem., 259, 2900-2904.