2M1E:
reference: Biosynthetic engineered B28(K)-B29 (P) human insulin monomer structure in water and in water/acetonitrile solutions., Borowicz P, Bocian W, Sitkowski J, Bednarek E, Mikiewicz-Sygula D, Kurzynoga D, Stadnik D, Surmacz-Chwedoruk W, Kozminski W, Kozerski L, J Biomol NMR. 2013 Feb 13. PMID: 23404086

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