1BHU:
reference: NMR structure of the Streptomyces metalloproteinase inhibitor, SMPI, isolated from Streptomyces nigrescens TK-23: another example of an ancestral beta gamma-crystallin precursor structure., Ohno A, Tate S, Seeram SS, Hiraga K, Swindells MB, Oda K, Kainosho M, J Mol Biol 1998 Sep 18;282(2):421-33. PMID: 9735297

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