Fig. 2.1.
The signal transduction pathway for E. coli chemotaxis. Chemoreceptors (MCPs) span the cytoplasmic membrane (hatched lines), with a ligand-binding domain on the periplasmic side and a signaling domain on the cytoplasmic side. The cytoplasmic signaling proteins are represented by single letters, e.g., A = CheA. (From [34] with permission.)