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Chemotropism and chemotaxis have been demostrated in a variety of vegetative and reproductive cell types in both higher and lower plants and animals. None of the naturally occurring chemotropic or chemotactic agents, nor the mechanisms of their action, have been identified. Nevertheless, certain common characteristics can be noted. Based on parallels which have been observed in various instances of chemotropism and chemotaxis, as well as on mechanisms of action which have been proposed, some suggestions are made regarding potentially useful areas of futher investigation into problems of mechanisms and of comparative physiology of chemotropic and chemotactic substances.
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Walter G. Rosen (1962) studied this question.
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