Chemotaxis
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Medpedia on Chemotaxis (Less technical, good quality control)
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Chemotaxis is movement in response to a chemical (gradient). Usually used in sense of cells directing their movements according to chemicals in their environment. Positive chemotaxis is movement toward a higher concentration of a chemical that is a chemoattractant. Negative chemotaxis would be towards a lower concentration of a chemical. Chemorepellents that cause movement away from their high concentration also exist.
