2IN8:
reference: Crystallographic and mutational studies of Mycobacterium tuberculosis recA mini-inteins suggest a pivotal role for a highly conserved aspartate residue., Van Roey P, Pereira B, Li Z, Hiraga K, Belfort M, Derbyshire V, J Mol Biol. 2007 Mar 16;367(1):162-73. Epub 2006 Dec 23. PMID: 17254599

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