4BW7:
reference: Crystallographic snapshots of initial steps in the collapse of the calmodulin central helix., Kursula P, Acta Crystallogr D Biol Crystallogr. 2014 Jan;70(Pt 1):24-30. doi:, 10.1107/S1399004713024437. Epub 2013 Dec 24. PMID: 24419375

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