2N2X:
reference: Rational steering of insulin binding specificity by intra-chain chemical crosslinking., Vikova J, Collinsova M, Kletvikova E, Budesinsky M, Kaplan V, Zakova L, Veverka V, Hexnerova R, Avino RJ, Strakova J, Selicharova I, Vanek V, Wright DW, Watson CJ, Turkenburg JP, Brzozowski AM, Jiracek J, Sci Rep. 2016 Jan 21;6:19431. doi: 10.1038/srep19431. PMID: 26792393

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