4P6B:
reference: Crystallographic analysis and biochemical applications of a novel penicillin-binding protein/beta-lactamase homologue from a metagenomic library., Ngo TD, Ryu BH, Ju H, Jang EJ, Kim KK, Kim TD, Acta Crystallogr D Biol Crystallogr. 2014 Sep 1;70(Pt 9):2455-66. doi:, 10.1107/S1399004714015272. Epub 2014 Aug 29. PMID: 25195758

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