Additional file 2.

The HGT+/- proteomic trees. This experiment involves the 415 microorganisms recorded in the HGT database that are known to possess horizontally transferred genes [44]. (a) Tree HGT+: the proteomic tree constructed using whole genomes. (b) HGT-: the proteomic tree constructed with horizontally transferred genes removed. For clarity, Tree HGT+ is divided into several large clusters, each of which is painted with a unique color. The color of a species in Tree HGT- is given according to the color of the species in Tree HGT+. Clearly, the color patterns of both trees are very similar. Indeed, the correlation coefficient between these two trees is very high (0.93), indicating a high similarity in topology between these trees.

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Lee et al. BMC Genomics 2012 13:157   doi:10.1186/1471-2164-13-157