Ix. Distribution of Amino Acids under the Influence of Thyroxine1

tumors following radiothyroidectomy in mice. Later, Furth et at. (8) discovered that such tumors were capable of secreting thyrotropin and isolated from them both de pendent and autonomous strains, responsive and non responsive to thyroxine. Detailed studies have been made in this laboratory (10, 11, 14—16) with 3 strains of thyrotropic tumor obtained from Dr. Furth. Growth of 1 strain, dependent responsive, 4183, is suppressed by the administration of thyroid hormone to the host. Tumor cell implants of this strain can be suppressed by thyroxine

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