FIG 4 .

Transporters that are actively expressed by members of the acI lineage, as inferred from consensus annotations of genes associated with transport reactions present in metabolic network reconstructions. The intensity of the color indicates the log₂ fold change relative to the median value determined for the encoding gene cluster. For multisubunit transporters, the RPKM of the substrate-binding subunit was chosen (see Table S13 in Data Set S1). For some transporters, consensus annotations have been replaced with broad metabolite classes. Such metabolite classes are indicated with superscripts, and the original annotations are as follows: 1, spermidine and putrescine; 2, maltose; 3, xylose; 4, ribose; 5, uracil; 6, cytosine/purine/uracil/thiamine/allantoin; 7, xanthine/uracil/thiamine/ascorbate.