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Q. Which one of the following hormones contains iodine? (UPSC Prelims 1995)
Answer: Thyroxine
Notes: Thyroxine, the most abundant thyroid hormone, contains four iodine atoms and is nicknamed T4, while triiodothyronine, the most active form, has three and is referred to as T3. CAPTION: The thyroid synthesizes thyroid hormone from tyrosine and iodide.
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