1YIU:
reference: Phosphorylation of either Ser16 or Thr30 does not disrupt the structure of the Itch E3 ubiquitin ligase third WW domain., Shaw AZ, Martin-Malpartida P, Morales B, Yraola F, Royo M, Macias MJ, Proteins 2005 Aug 15;60(3):558-60. PMID: 15971201

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