4A8H:
reference: New insight into the transcarbamylase family: the structure of putrescine transcarbamylase, a key catalyst for fermentative utilization of agmatine., Polo LM, Gil-Ortiz F, Cantin A, Rubio V, PLoS One. 2012;7(2):e31528. Epub 2012 Feb 20. PMID: 22363663

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