5UCG:
reference: A widespread family of serine/threonine protein phosphatases shares a common regulatory switch with proteasomal proteases., Bradshaw N, Levdikov VM, Zimanyi CM, Gaudet R, Wilkinson AJ, Losick R, Elife. 2017 May 20;6. pii: e26111. doi: 10.7554/eLife.26111. PMID: 28527238

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