Nitrogen excretion in the tadpoles of Xenopus laevis Daudin

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Abstract
Excretion of N in the form of ammonia and urea by Xenopus tadpoles were studied up to the end of metamorphosis. There is a marked increase in the relative proportion of urea N in the early stages of metamorphosis followed by a fall as metamorphosis proceeds. The total N excreted per gram body weight per 24 hours shows a sharp increase in the late stages of metamorphosis.