Alignments of the protein translations of the whole genomes of all four Providencia species isolated from D. melanogaster. The contigs of P. sneebia and P. rettgeri were ordered and oriented as they are in the physical genome based on optical maps made of each genome. P. alcalifaciens and P. burhodogranariea contigs were ordered and oriented for maximum synteny with P. rettgeri, therefore assuming parsimony in the number of genomic arrangements. Similarity was calculated using promer function in MUMmer. Red dots represent similar sequence in the same orientation in each genome pair while blue indicates that the similarity is in the opposite orientations in the genome pairs.