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由甲状腺合成和分泌的甲状腺素(T_4)及三碘甲状腺原氨酸(T_3,仅占20%,另80%为 T_4在外周组织脱碘转化而成)
Thyroid hormone (T_4) and triiodothyronine (T_3, only 20%, T_4 is 80% T_4) which is synthesized and secreted by the thyroid,