3TMS:
reference: Plastic adaptation toward mutations in proteins: structural comparison of thymidylate synthases., Perry KM, Fauman EB, Finer-Moore JS, Montfort WR, Maley GF, Maley F, Stroud RM, Proteins 1990;8(4):315-33. PMID: 2128651

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