6GX9:
reference: Differential role for phosphorylation in alternative polyadenylation function versus nuclear import of SR-like protein CPSF6., Jang S, Cook NJ, Pye VE, Bedwell GJ, Dudek AM, Singh PK, Cherepanov P, Engelman AN, Nucleic Acids Res. 2019 Mar 27. pii: 5420532. doi: 10.1093/nar/gkz206. PMID: 30916345

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