2NA0:
reference: Structure of Guanylyl Cyclase Activator Protein 1 (GCAP1) Mutant V77E in a Ca2+-free/Mg2+-bound Activator State., Lim S, Peshenko IV, Olshevskaya EV, Dizhoor AM, Ames JB, J Biol Chem. 2015 Dec 24. pii: jbc.M115.696161. PMID: 26703466

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