31. In males, testes are often small, but spermatogenesis is thought to be normal. 32. They control spermatogenesis and the ovarian cycle, parturition, lactation, and maternal behaviour. 33. In 1879 Mathias Duval made studies of spermatogenesis in " Viviparus viviparus ") 34. This gene belongs to the RBMY gene family which includes candidate Y chromosome spermatogenesis genes. 35. Mutation and knockout studies of the mouse gene demonstrated an essential role in adult spermatogenesis . 36. Studies of the mouse and rat counterparts suggested a role of this protein in spermatogenesis . 37. It is well known that many epigenetic changes occur during spermatogenesis to create viable sperm. 38. Protamines are small, nuclear proteins that replace histones during the haploid stage in spermatogenesis . 39. :Spermatogenesis occurs only in Seminiferous tubules whose surgical removal leaves the man permanently sterile. 40. The classic hypothesis is that cooler temperature of the testes allows for more efficient fertile spermatogenesis .
