Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
The three central stages of male germline functions. A: Spermatogenesis. B: Spermiogenesis. C: Fertilization. A blue square shows that a sperm contacts the oocyte plasma membrane through its pseudopod. In these figures, the approximate point where a spe gene is first observed to act (by light microscopy) is indicated in red letters.
