2FFL:
reference: Structural basis for double-stranded RNA processing by Dicer., Macrae IJ, Zhou K, Li F, Repic A, Brooks AN, Cande WZ, Adams PD, Doudna JA, Science. 2006 Jan 13;311(5758):195-8. PMID: 16410517

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