2A3G:
reference: The structure of T6 bovine insulin., Smith GD, Pangborn WA, Blessing RH, Acta Crystallogr D Biol Crystallogr. 2005 Nov;61(Pt 11):1476-82. Epub 2005, Oct 19. PMID: 16239724

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