L-Thyroxine molecule is the thyroid hormone that is chemically identical to thyroxine (T4), which is naturally secreted by the follicular cells of the thyroid gland Back to the tutorial.

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The related drug dextrothyroxine (D-thyroxine) was used in the past to replace naturally secreted T4 for decrease elevated cholesterol levels that for treatment hypercholesterolemia (elevated cholesterol levels) but was withdrawn due to cardiac side effects.


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