2LWY:
reference: Structural basis for Protein Trans-Splicing by a Bacterial Intein-Like domain: Protein Ligation without Nucleophilic side-chains., Aranko AS, Oeemig JS, Iwai H, FEBS J. 2013 Apr 27. doi: 10.1111/febs.12307. PMID: 23621571

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