6NTW:
reference: Structural insight into YcbB-mediated beta-lactam resistance in Escherichia coli., Caveney NA, Caballero G, Voedts H, Niciforovic A, Worrall LJ, Vuckovic M, Fonvielle M, Hugonnet JE, Arthur M, Strynadka NCJ, Nat Commun. 2019 Apr 23;10(1):1849. doi: 10.1038/s41467-019-09507-0. PMID: 31015395

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