1E25:
reference: The high resolution crystal structure for class A beta-lactamase PER-1 reveals the bases for its increase in breadth of activity., Tranier S, Bouthors AT, Maveyraud L, Guillet V, Sougakoff W, Samama JP, J Biol Chem 2000 Sep 8;275(36):28075-82. PMID: 10825176

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