1DVI:
reference: Structure of a calpain Ca(2+)-binding domain reveals a novel EF-hand and Ca(2+)-induced conformational changes., Blanchard H, Grochulski P, Li Y, Arthur JS, Davies PL, Elce JS, Cygler M, Nat Struct Biol 1997 Jul;4(7):532-8. PMID: 9228945

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