1EQB:
reference: Role of tyrosine 65 in the mechanism of serine hydroxymethyltransferase., Contestabile R, Angelaccio S, Bossa F, Wright HT, Scarsdale N, Kazanina G, Schirch V, Biochemistry. 2000 Jun 27;39(25):7492-500. PMID: 10858298

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