Transcription ratios of E. coli B REL606 to K-12 MG1655 at exponential (E) and stationary (S) growth phases during growth in LB medium. Internal lines were positioned at ±1.0 on both axes denoting log2-transformed expression ratios. The numbers of genes within each range of expression ratios are shown. A functional category using the COG database  was assigned to each gene and color-coding was employed as follows: red circles, amino acid transport and metabolism; blue circles, cell motility; green circles, energy production and conversion; black circles, biogenesis of cell wall components; empty circles, other or unknown function.
Yoon et al. Genome Biology 2012 13:R37 doi:10.1186/gb-2012-13-5-r37