3N4I:
reference: Specificity and cooperativity at beta-lactamase position 104 in TEM-1/BLIP and SHV-1/BLIP interactions., Hanes MS, Reynolds KA, McNamara C, Ghosh P, Bonomo RA, Kirsch JF, Handel TM, Proteins. 2010 Dec 13. doi: 10.1002/prot.22961. PMID: 21294157

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