Iodine is a micronutrient needed for the production of thyroid hormones. The thyroxine-binding globulin (TBG) is one of three transport proteins responsible for carrying thyroxine (T4) and triiodothyronine (T3) in our bloodstream. TBG is one of only three thyroid hormone-binding carriers, but differs strongly from the other two. It has the highest affinity for T4 and T3 but is present in the lowest concentration as well as having only a single binding site for T4/T3.
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