5KL1:
reference: Drosophila Nanos acts as a molecular clamp that modulates the RNA-binding and repression activities of Pumilio., Weidmann CA, Qiu C, Arvola RM, Lou TF, Killingsworth J, Campbell ZT, Tanaka Hall TM, Goldstrohm AC, Elife. 2016 Aug 2;5. pii: e17096. doi: 10.7554/eLife.17096. PMID: 27482653

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