4JA0:
reference: Crystal structure of the invertebrate bifunctional purine biosynthesis enzyme PAICS at 2.8 A resolution., Taschner M, Basquin J, Benda C, Lorentzen E, Proteins. 2013 Aug;81(8):1473-8. doi: 10.1002/prot.24296. Epub 2013 Jun 1. PMID: 23553965

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