6BX8:
reference: Disulfide engineering of human Kunitz-type serine protease inhibitors enhances proteolytic stability and target affinity toward mesotrypsin., Cohen I, Coban M, Shahar A, Sankaran B, Hockla A, Lacham S, Caulfield TR, Radisky ES, Papo N, J Biol Chem. 2019 Jan 30. pii: RA118.007292. doi: 10.1074/jbc.RA118.007292. PMID: 30700553

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