Abstract

Serum Ca concentrations in ultimobranchialectomized bullfrog tadpoles increased markedly in a high Ca environment. However, tadpoles implanted with the ultimobranchial glands of bullfrog tadpoles, or of Rana nigromaculata, showed no changes in serum Ca levels. The administration of synthetic salmon calcitonin (5 MRC units per individual) to the ultimobranchialectomized tadpoles partially suppressed the acute rise of serum Ca concentrations in a high Ca environment.

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