thyroxine
Noun
Meaning
thyroxine (countable and uncountable, plural thyroxines)
(biochemistry) A hormone (an iodine derivative of tyrosine), produced by the thyroid gland, that regulates cell metabolism and growth.
Synonyms
Examples
A few days later, the tail is reabsorbed, due to the higher thyroxine concentration required for this to take place.
In amphibian metamorphosis, thyroxine and iodine also exert a well-studied experimental model of apoptosis on the cells of gills, tail, and fins of tadpoles.
The "daily pill" these writers are talking about is levothyroxine (brand names: Synthroid, Levoxyl, Levothyroid), a thyroid hormone replacement that contains a synthetic version of the thyroid hormone T4 (thyroxine).
For adaptation to a water phase, prolactin is the required hormone, and for adaptation to the land phase, thyroxine.
This type of cretinism has been almost completely eliminated in developed countries by early diagnosis by newborn screening schemes followed by lifelong treatment with thyroxine (T4).
Thyroid hormones such as 3,5,3’-triiodothyronine (T3) and 3,5,3’,5’-tetraiodothyronine (thyroxine, T4) make up a subset of this class because they derive from the combination of two iodinated tyrosine amino acid residues.