PA2 catalyzes the calcium-dependent hydrolysis of the 2-acyl groups in 3-sn-phosphoglycerides. Testis PA2 may be important in the production of prostaglandins, by the release of arachidonic acid, which in turn are necessary for the contractions of the seminiferous tubules and the testicular capsule; they also seem to decrease sperm transit time through the male reproductive tract. a 1,2-diacyl-sn-glycero-3-phosphocholine + H2O = a 1-acyl-sn-glycero-3-phosphocholine + a fatty acid + H(+) Binds 1 Ca(2+) ion per subunit. Testis specific. Expressed mainly in pachytene and secondary spermatocytes and round spermatids and predominates in stage VI-VII tubules. Belongs to the phospholipase A2 family.