3FVZ:
reference: Amidation of bioactive peptides: the structure of the lyase domain of the amidating enzyme., Chufan EE, De M, Eipper BA, Mains RE, Amzel LM, Structure. 2009 Jul 15;17(7):965-73. PMID: 19604476

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