+ATT flagellar +cH3-8 motor MCPs MCPs CW PA--CHa ATP ATP ADP Z B (YP, Figure 1 of Spiro, P. A, J.S. Parkinson, and H. G. Othmer A model of excitation and adaptation in bacterial chemotaxis Proc Nat/ Acad SciU sA 94, no 14 Jul 8, 1997):7263-8 Copyright (1997) National Academy of Sciences, U.S.A key player: Tar-CheA-CheW complexkey player: Tar-CheA-CheW complex Copyright (1997) National Academy of Sciences, U. S. A. Figure 1 of Spiro, P. A., J. S. Parkinson, and H. G. Othmer. Proc Natl Acad Sci U S A 94, no. 14 (Jul 8, 1997): 7263-8. "A model of excitation and adaptation in bacterial chemotaxis