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.
Ki67 staining of fetal testis on day 68. Representative low-power (× 10 objective) photomicrograph shows the distribution of proliferating cells. Note highly concentrated proliferative activity within the sex cords, indicating that GCs expand in a protected environment after compartmentalization. R, internal rete testes; C, testicular cortex; T, tunica albuginea.
