Table 1  Number of genes used for the visualization for all species under consideration. Given are the number of putative alien genes, the number of ribosomal protein genes and the total number of genes on the respective chromosomes.
species  # genes (total)  # ribosomal protein genes  # putative alien genes
E. coli  4254  61  206
B. subtilis  4106  57  317
V. cholerae Chr1  2736  64  41
V. cholerae Chr2  1092  0  216
T. thermophilus  1973  60  5