1TM4:
reference: Binding, proteolytic, and crystallographic analyses of mutations at the protease--inhibitor interface of the subtilisin BPN'/chymotrypsin inhibitor 2 complex., Radisky ES, Kwan G, Karen Lu CJ, Koshland DE Jr, Biochemistry 2004 Nov 2;43(43):13648-56. PMID: 15504027

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