FIG. 2.

Distribution of osmolyte transport and synthesis systems among seven Vibrio species and E. coli K-12. Arrows indicate the direction of transcription. Transporters belonging to the BCCT family are represented by diagonal stripes. Solid black arrows represent putative genes involved in ectoine synthesis. Open arrows indicate hypothetical proteins. Vertical stripes represent genes homologous to that which encodes the ProU (ProVWX) transporter. Dashed lines indicate genes involved in glycine betaine synthesis (betABI). The grid arrow represents the ProP transporter of E. coli K-12.