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1: Structural basis for MutH activation in E.coli mismatch repair and relationship of MutH to restriction endonucleases. Ban C, Yang W; EMBO J 1998;17:1526-1534. PMID:9482749

2: Sequence, structure and functional diversity of PD-(D/E)XK phosphodiesterase superfamily. Steczkiewicz K, Muszewska A, Knizewski L, Rychlewski L, Ginalski K; Nucleic Acids Res. 2012;40:7016-7045. PMID:22638584