4ZRL:
reference: Structural basis for the activation of the C. elegans noncanonical cytoplasmic poly(A)-polymerase GLD-2 by GLD-3., Nakel K, Bonneau F, Eckmann CR, Conti E, Proc Natl Acad Sci U S A. 2015 Jun 29. pii: 201504648. PMID: 26124149

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