Development of Mature Sperm (2 of 2) (IMAGE) Kyoto University Caption Detailed pathway of how dephosphorylation of Protamine 2 at serine 56 produces proper functioning sperm cells. Credit Kyoto University/Itoh Lab Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.