MOLEKUUL / SCIENCE PHOTO LIBRARY MOLEKUUL / SCIENCE PHOTO LIBRARY
Thyroxine (T4, levothyroxine) thyroid hormone molecule. Prohormone of thyronine (T3). Used as drug to treat hypothyroidism. Stylized skeletal formula (chemical structure). Atoms are shown as color-coded circles: hydrogen (hidden), carbon (grey), nitrogen (blue), oxygen (red), iodine (purple).
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