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.
Protamine expression in mouse species and association with sperm head shape. Ratios of Prm1-to-Prm2 mRNA levels vary among closely related mouse species of the genus Mus with a parallel increase in sperm competition levels (as revealed by the proxy of relative testis mass). Based on data in Lüke et al. (452).
