2A1S:
reference: Structural insight into poly(A) binding and catalytic mechanism of human PARN., Wu M, Reuter M, Lilie H, Liu Y, Wahle E, Song H, EMBO J 2005 Dec 7;24(23):4082-93. Epub 2005 Nov 10. PMID: 16281054

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