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.
Source organisms of protein structures deposited in the PDB. (A) Structures of proteins produced in cell-free systems. (B) Structures produced by SG centers utilizing E. coli expression systems. Structures determined by NMR and X-ray diffraction methods are separated. “Other” indicates proteins originating mainly from bacterial genomes.
