1SRD:
reference: Three-dimensional structure of Cu,Zn-superoxide dismutase from spinach at 2.0 A resolution., Kitagawa Y, Tanaka N, Hata Y, Kusunoki M, Lee GP, Katsube Y, Asada K, Aibara S, Morita Y, J Biochem (Tokyo) 1991 Mar;109(3):477-85. PMID: 1880134

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