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.
Cartoon representations of alternative models for the FAS. (A) The fully extended, head-to-tail orientated subunit model. (B) The head-to–head, coiled subunit model. In both models, arrows indicate the functional interactions occurring between domains, inter- and intrasubunit.
