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1 Division of Physiology of the University of California Medical School, Berkeley
1. 2,4-Dinitrophenol (DNP) was injected intraperitoneally into rats for 1 to 29 days. A characteristic finding in all rats so treated was a lowering in the concentrations of protein-bound iodine of plasma to approximately half those found in the control animals.
2. This fall in the level of plasma protein-bound iodine was not accompanied by an enlargement of the thyroid gland nor by a change in its histological appearance. Moreover, the amounts of total and thyroxine-like iodine of the gland were unaffected.
The uptake of injected I131 and its conversion to organic forms by the thyroid gland of DNP-treated rats remained normal.
Submitted on August 15, 1949