Although the production of thyroxine (T4) in the developing ovine fetus ranges from 20 to 50 micrograms.kg-1.day-1, production rates for 3,5,3'-triiodothyronine (T3) average only 1-2 micrograms.kg-1.day-1, whereas reverse T3 (rT3) production rates approach 5-6 micrograms.kg-1.day-1. Thus the fate of the majority of fetal T4 production is uncertain. Recently… (More)
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