(Liothyronine; T3 Thyroid Hormone)
A T3 thyroid hormone normally synthesized and secreted by the thyroid gland
in much smaller quantities than thyroxine
(T4). Most T3 is derived from peripheral monodeiodination of T4 at the 5' position of the outer ring of the iodothyronine nucleus. The hormone finally delivered and used by the tissues
is mainly T3.
Triiodothyronine - Wikipedia
prohormone, perhaps four  or even ten times more active. 
Triiodothyronine, Reverse triiodothyronine, Polar T3 syndrome, Tiratricol, Triac (car), Quadrac, Jul i Tøyengata, I-Télé, Út?chovice pod Stražišt?m, Egl? Šul?i?t?
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