5N4E:
reference: Characterization of a dual function macrocyclase enables design and use of efficient macrocyclization substrates., Czekster CM, Ludewig H, McMahon SA, Naismith JH, Nat Commun. 2017 Oct 19;8(1):1045. doi: 10.1038/s41467-017-00862-4. PMID: 29051530

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