4XD1:
reference: New Role for the Ankyrin Repeat Revealed by a Study of the N-Formyltransferase from Providencia alcalifaciens., Woodford CR, Thoden JB, Holden HM, Biochemistry. 2015 Jan 15. PMID: 25574689

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