7INS:
reference: Structure of porcine insulin cocrystallized with clupeine Z., Balschmidt P, Hansen FB, Dodson EJ, Dodson GG, Korber F, Acta Crystallogr B 1991 Dec 1;47 ( Pt 6):975-86. PMID: 1772633

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