5TKZ:
reference: Conserved binding of GCAC motifs by MEC-8, couch potato and the RBPMS protein family., Soufari H, Mackereth CD, RNA. 2016 Dec 21. pii: rna.059733.116. doi: 10.1261/rna.059733.116. PMID: 28003515

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