6INS:
reference: X-ray analysis of the single chain B29-A1 peptide-linked insulin molecule. A completely inactive analogue., Derewenda U, Derewenda Z, Dodson EJ, Dodson GG, Bing X, Markussen J, J Mol Biol 1991 Jul 20;220(2):425-33. PMID: 1856866

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