2MHH:
reference: The number and location of EF hand motifs dictates the calcium dependence of polycystin-2 function., Kuo IY, Keeler C, Corbin R, Celic A, Petri ET, Hodsdon ME, Ehrlich BE, FASEB J. 2014 May;28(5):2332-46. doi: 10.1096/fj.13-247106. Epub 2014 Feb 20. PMID: 24558196

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