In the past thirty years, significant advances have been made in the field of reproductive biology in unlocking the molecular and biochemical events that regulate spermatogenesis in the mammalian testis. It was possible because of the unprecedented breakthroughs in molecular biology, cell biology, immunology, and biochemistry. I am fortunate to have personally witnessed such rapid changes in the field since I was a graduate student and a postdoctoral fellow in the late 70s through the early 80s. In this book entitled, Molecular Mechanisms in Spermatogenesis, I have included a collection of...