2LTR:
reference: Structure of RDE-4 dsRBDs and mutational studies provide insights in the dsRNA recognition in C. elegans RNAi pathway., Chiliveri SC, Deshmukh MV, Biochem J. 2013 Nov 21. PMID: 24256178

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