3G8M:
reference: Role of a Conserved Active Site Cation-pi Interaction in Escherichia coli Serine Hydroxymethyltransferase., Vivoli M, Angelucci F, Ilari A, Morea V, Angelaccio S, di Salvo ML, Contestabile R, Biochemistry. 2009 Nov 2. PMID: 19883126

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