6ZGQ:
reference: Biochemical and structural characterization of an unusual and naturally split class 3 intein., Hoffmann S, Terhorst TME, Singh RK, Kummel D, Pietrokovski S, Mootz HD, Chembiochem. 2020 Aug 19. doi: 10.1002/cbic.202000509. PMID: 32813312

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