Administration of thiouracil and of small amount of iodine which caused the thyroid gland to show histological picture of hyperfunction, considerably reduced the free tyro-sine content per unit weight of the gland and increased its concentration in the plasma. 在硫尿嘧啶和小剂量碘的作用下,甲状腺内的游离酪氨酸含量(以每单位组织算)显著减少,而血浆的游离酪氨酸浓度增高。