Aligning a co-directional true overlap. Overlap between the holD (coding for a DNA polymerase psi subunit) and rimI (coding for an alanine acetyltransferase) genes among Enterobacteria. A) Multiple alignment of the C-terminal of the DNA polymerase psi subunit and the N-terminal of the alanine acetyltransferase protein among Enterobacteria species. The grey boxes indicate the fragments that are encoded in the overlapping region between holD and rimI genes. The alignments of Escherichia & Shigella, Salmonella and Yersinia are marked. B) Arrangement of overlapping regions and amino acid conservation within the overlap among Escherichia coli K12, Salmonella enterica Ty2 and Yersinia pestis CO92. The nucleotide consensus shows an asterisk for the conserved nucleotides and a dot for the not conserved. Although we chose one species of each group marked in part A (Escherichia & Shigella, Salmonella and Yersinia) we can observe the high similarity at the level of sample nucleotide sequences too.