colloidal gold conjugates of monoclonal antibody sp56 , which binds to the surface of spermatozoa , and tr20 , which recognizes the major sperm cytoplasmic protein ( msp ) , were used to label thin sections of testes embedded in lowicryl k4m in order to follow polypeptides from their synthesis early in spermatogenesis to their segregation to specific compartments of the mature cell .
C0037868
spermatozoa
C0037864
spermatogenesis