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.
Comparison of size and gene organization for X and Y chromosomes. Approximate locations of chromosome-specific genes for zinc finger proteins (ZFX and ZFY) and ribosomal proteins (RPS4X and RPS4Y) are shown, as well as locations for chromosome-specific amelogenin (Amel) genes used for sex determination. See text for details.
