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Sequence alignment of OacB, OacC, and Oac (or OacA), the proteins involved in O-acetylation modification of S. flexneri . Asterisks and dots indicate the amino acid residues that are identical or similar, respectively. Amino acids identical between OacB and OacC are shown in shadow. The three major regions conserved among the inner membrane trans-acylase family proteins are marked by black box. The three critical residues for the Oac (OacA) function are marked by red box.
