5DOW:
reference: Solution of the structure of a calmodulin-peptide complex in a novel configuration from a variably twinned data set., Keller JP, Acta Crystallogr D Struct Biol. 2017 Jan 1;73(Pt 1):22-31. doi:, 10.1107/S2059798316019318. Epub 2017 Jan 1. PMID: 28045382

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