1G4Y:
reference: Structure of the gating domain of a Ca2+-activated K+ channel complexed with Ca2+/calmodulin., Schumacher MA, Rivard AF, Bachinger HP, Adelman JP, Nature 2001 Apr 26;410(6832):1120-4. PMID: 11323678

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