http://en.wikipedia.org/wiki/Chemotaxis
Chemotaxis (from chemo- + taxis) is movement of an organism in response to a chemical stimulus. Somatic cells, bacteria, and other single-cell or multicellularorganisms direct their movements according to certain chemicals in their environment. This is important for bacteria to find food (for example, glucose) by swimming toward the highest concentration of food molecules, or to flee from poisons (for example, phenol). In multicellular organisms, chemotaxis is critical to early development (e.g., movement of sperm towards the egg during fertilization) and subsequent phases of development (e.g., migration of neurons or lymphocytes) as well as in normal function. In addition, it has been recognized that mechanisms that allow chemotaxis in animals can be subverted during cancer metastasis.
Chemotaxis (from chemo- + taxis) is movement of an organism in response to a chemical stimulus. Somatic cells, bacteria, and other single-cell or multicellularorganisms direct their movements according to certain chemicals in their environment. This is important for bacteria to find food (for example, glucose) by swimming toward the highest concentration of food molecules, or to flee from poisons (for example, phenol). In multicellular organisms, chemotaxis is critical to early development (e.g., movement of sperm towards the egg during fertilization) and subsequent phases of development (e.g., migration of neurons or lymphocytes) as well as in normal function. In addition, it has been recognized that mechanisms that allow chemotaxis in animals can be subverted during cancer metastasis.
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