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.
α-helices, red; β-sheets, yellow; β-bridges, orange, loops and turns, white; Ca2+ ion, black; γR375, magenta; γK380, cyan; and γK381, blue.
