2RSD:
reference: PHD finger of the SUMO ligase Siz/PIAS family in rice reveals specific binding for methylated histone H3 at lysine 4 and arginine 2., Shindo H, Suzuki R, Tsuchiya W, Taichi M, Nishiuchi Y, Yamazaki T, FEBS Lett. 2012 Jun 21;586(13):1783-9. Epub 2012 May 21. PMID: 22626555

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