1BSR:
reference: Bovine seminal ribonuclease: structure at 1.9 A resolution., Mazzarella L, Capasso S, Demasi D, Di Lorenzo G, Mattia CA, Zagari A, Acta Crystallogr D Biol Crystallogr. 1993 Jul 1;49(Pt 4):389-402. PMID: 15299514

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