1TNQ:
reference: Structures of the troponin C regulatory domains in the apo and calcium-saturated states., Gagne SM, Tsuda S, Li MX, Smillie LB, Sykes BD, Nat Struct Biol 1995 Sep;2(9):784-9. PMID: 7552750

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