6N9D:
reference: Directed evolution of the metalloproteinase inhibitor TIMP-1 reveals that its N- and C-terminal domains cooperate in matrix metalloproteinase recognition., Raeeszadeh-Sarmazdeh M, Greene KA, Sankaran B, Downey GP, Radisky DC, Radisky ES, J Biol Chem. 2019 Apr 30. pii: RA119.008321. doi: 10.1074/jbc.RA119.008321. PMID: 31040180

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