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 structure of bR (left), showing the retinal chromophore (yellow) and the active site (upper right), which consists of a hydrogen bonding network that connects the retinal with two aspartates (D85 and D12) and three water molecules. The proton release group (PRG) consists of two glutamates (E194 and E204), several water molecules and arginine 82 (lower right).
