Chapter 18 18.1 Introduction Review Alon, U., 2007. An Introduction to Systems Biology. Design Principles of Biological Networks. Chapman and Hall. Sauro, H. M., and Kholodenko, B. N., 2004. Quantitative analysis of signaling networks. Prog. Biophys. Mol. Biol. v. 86 p. 5–43. Research Milo, R., Shen-Orr, S., Itzkovitz, S., Kashtan, N., Chklovskii, D., and Alon, U., 2002. Network motifs: simple building blocks of complex networks. Science v. 298 p. 824–827. 18.2 Cellular signaling is primarily chemical Review Arshavsky, V. Y., Lamb, T. D., and Pugh, E. N., Jr., 2002. G proteins and phototransduction. Annu. Rev. Physiol. v. 64 p. 153–187. Caterina, M. J., and Julius, D., 2001. The vanilloid receptor: a molecular gateway to the pain pathway. Annu. Rev. Neurosci. v. 24 p. 487–517. Gillespie, P. G., and Cyr, J. L., 2004. Myosin-1c, the hair cell’s adaptation motor. Annu. Rev. Physiol. v. 66 p. 521–545. Lin, C., and Shalitin, D., 2003. Cryptochrome structure and signal transduction. Annu. 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