Sarmiento-Rubiano et al. BMC Genomics 2010, 11:504 http://www.biomedcentral.com/1471-2164/11/504 Page 12 of 16 Figure 5 Comparative Genomic Hybridization (CGH) data. (A) Frequency distribution histograms of the CGH data. The reference strain is L. johnsonii NCC533. Ratios are expressed in a log2 scale; (B) CGH data mapped on L. johnsonii NCC533. Each horizontal row corresponds to a specific coding region on the array and the genes are vertically ordered according to their positions on the L. johnsonii NCC533 genome. The columns represent the strains analyzed, identified by their code numbers. The colour-code gradient ranges from black (presence of a homologous gene) to white (divergence or absence of a gene). Some relevant genes are shown on the left (conserved) or right (variable) alongside the genome. The asterisk showed conserved genes in L. taiwanensis, which are optional in L. johnsonii.