The percentage of changes by species (%chSp) of 1416 chromosomal orthologs from five Rhizobiales. The panels show 1416 orthologs for each of the species (7080 ortholog products in total). A, the %chSp arranged progressively according to the % of common identity of each ortholog from the five organisms (black line). Color dots: orange, R. etli; red, A. tumefaciens; blue, S. meliloti; green, Brucella melitensis; and yellow (or brown) M. loti. B, frequency distribution curves for the %chSp of the five organisms. Values above 50% were omitted for clarity. Color lines as in A, with exception of brown for M. loti. C, functional distribution of orthologs by species signature. Data from R. etli products. Functions were classified into Metabolism (red line, including amino acid, nucleotide, fatty acid, and cofactor biosynthesis, central intermediary metabolism, and energy generation), Information (green line, DNA metabolism, transcription, translation, and transcriptional regulators), Processes (blue line, transport; cellular envelope synthesis, and other cellular processes), and Hypothetical functions or poorly characterized proteins (orange line).