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The question as to the relationship between the ultimobranchial body and the thyroid anlage has been repeatedly reviewed and discussed, yet no satisfactory answer has been obtained. Zucker kandl (1903), Henn eb erg (1905), and Rog er s (1926) have already described that the thyroid parenchyma in the rat is partly derived from the ultimobranchial body, but I have obtained other results than from these authors.

The Fate of the Ultimobranchial Body of the Albino Rat with Special Reference to the Formation of the Thyroid Gland.