| 1XX2: reference: Evolution of an enzyme activity: crystallographic structure at 2-A resolution of cephalosporinase from the ampC gene of Enterobacter cloacae P99 and comparison with a class A penicillinase., Lobkovsky E, Moews PC, Liu H, Zhao H, Frere JM, Knox JR, Proc Natl Acad Sci U S A. 1993 Dec 1;90(23):11257-61. PMID: 8248237 |
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