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Conservation of the amino acid residues involved in χ recognition among RecC orthologs. Five regions of highly conserved sequence implicated in χ recognition are shown in WebLogo format (48, 49). Type 1 residues are in red, and type 2 in green. Residues in gray were mutated but did not affect χ recognition. Gap in line 2 reflects a very small number of RecC sequences (not including E. coli) having a single amino acid insert there (Fig. S3).
