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 coordination spheres of the metal-binding sites in Aa_Cel9A. (a) The zinc-binding site shows a tetrahedral coordination. (b, c) The two calcium-binding sites show polyhedral coordination formed exclusively from O atoms. For a complete discussion, see the main text.
