Figure 8
From: Horizontal gene transfer and the evolution of transcriptional regulation in Escherichia coli
Complex regulation of horizontally acquired genes. Horizontal gene transfer (HGT) genes were identified by an automated presence/absence method, and the number of different regulators for each gene was taken from RegulonDB. Genes without any known regulation were not included. HGT genes tend to have more regulators than other genes (P < 10-4, by Wilcoxon rank sum test; 354 HGT genes and 998 other genes).