Spermatogenesis refers to the process by which the production and development of the spermatozoa (the mature male gamete of most sexually reproducing species) occurs.It is a complex,stepwise process of sperm development,taking more than a month depending upon the species involving three specific functional phases:spermatogonial proliferation,meiosis and metamorphosis.1Investigators have been successful in recreating this process in some species of fish;however,this whole process has never been reproduced in vitro in mammals.