4NGF:
reference: A Phosphate-Binding Pocket within the Platform-PAZ-Connector Helix Cassette of Human Dicer., Tian Y, Simanshu DK, Ma JB, Park JE, Heo I, Kim VN, Patel DJ, Mol Cell. 2014 Feb 20;53(4):606-16. doi: 10.1016/j.molcel.2014.01.003. Epub 2014 , Jan 30. PMID: 24486018

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