1FR9:
reference: The crystal structure of the Escherichia coli MobA protein provides insight into molybdopterin guanine dinucleotide biosynthesis., Lake MW, Temple CA, Rajagopalan KV, Schindelin H, J Biol Chem 2000 Dec 22;275(51):40211-7. PMID: 10978347

This OCA Structure page
uses Jmol, developed by the Jmol Development Team (documentation).