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.
Crystal structure of human H-Ras complexed with the GTP analogue GppNp (66). The phosphate-binding P loop is highlighted in green. The positions of residues that when mutated give rise to two classes of dominant-negative Ras proteins are indicated (G15, red; S89, yellow).
