4HGC:
reference: Structure of a proteolytically resistant analogue of (NLys)(5)SFTI-1 in complex with trypsin: evidence for the direct participation of the Ser214 carbonyl group in serine protease-mediated proteolysis., Krzywda S, Jaskolski M, Rolka K, Stawikowski MJ, Acta Crystallogr D Biol Crystallogr. 2014 Mar;70(Pt 3):668-75. doi:, 10.1107/S1399004713032252. Epub 2014 Feb 15. PMID: 24598736

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