Additional data file 3.
For each organism group and gene transfer type (EGT and HGT) the following information is given: the number of enzymes predicted as being gene transfers; the number of these enzymes present within the KEGG metabolic network; the average number of connections between the nodes within the KEGG metabolic network; the average number of connection between the same number of enzymes calculated over 10,000 random samples; a P-value and a Z score based on these random samples. Then, for each of the gene transfer types, t-tests and Wilcoxon signed-rank tests are given to calculate the probability that the transfers are more connected than random over all the species groups.
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Whitaker et al. Genome Biology 2009 10:R36 doi:10.1186/gb-2009-10-4-r36