1U3F:
reference: Crystal structure of methenyltetrahydrofolate synthetase from Mycoplasma pneumoniae (GI: 13508087) at 2.2 A resolution., Chen S, Shin DH, Pufan R, Kim R, Kim SH, Proteins 2004 Sep 1;56(4):839-43. PMID: 15281135

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