Multiple sequence alignment of the predicted product from ORF13 and its homologs ORFU from Lactococcus lactis plasmid pNP10 (5), uvrA of E. faecalis (19), UV-damage repair protein of B. subtilis (accession no. Z99115), rumB of IncJ plasmid R391 from E. coli (12), samB from S. typhimurium (18), mucB of R46 plasmid from S. typhimurium (17), and the chromosomal umuC from S. typhimurium (26) and E. coli (20). Conserved amino acids are shaded in black and conservative substitutions are shaded in gray.