?:definition
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The directed movement of a motile cell or organism, or the directed growth of a cell guided by a specific chemical concentration gradient. Movement may be towards a higher concentration (positive chemotaxis) or towards a lower concentration (negative chemotaxis). [ISBN:0198506732]
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The movement of an organism, or part of an organism, in response to an external chemical gradient, usually toward or away from it. [GOC:jl, PMID:10087613]
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