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It was at one time generally thought that excretion in the Protozoa was a function of the contractile vacuole. This idea has now been largely discarded (except in relation to the excretion of water) and the authors considered it of interest to correlate the rate and amount of nitrogenous excretion with the activities of other cytoplasmic constituents.
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Doyle et al. (1937) studied this question.
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