Abstract
1. 1. The hypocalcemic activity of the ultimobranchial gland of the frog, Rana rugosa, was estimated using a rat bioassay method. 2. 2. Extracts of the ultimobranchial gland showed a very high hypocalcmic activity. The value corresponded to 6,340 mU (MRC)/kg b.w. 3. 3. Serum inorganic phosphorus values of rats received the extract decreased in proportion to the dose, although no changes were found in serum sodium concentration.
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