1. "Secretion of thyroid hormones-mostly thyroxine (T4)-is controlled by thyroid-stimulating hormone (TSH), released by the pituitary gland when the level of thyroid hormones in the Blood drops Below a certain threshold."
9. A white crystalline amino acid, C9H11NO3, that is derived from the hydrolysis of proteins such as casein and is a precursor of epinephrine, thyroxine, and melanin.
10. "Among the many mammalian hormones are ACTH, sex hormones, thyroxine, insulin, and epinephrine. Insect hormones include ecdysone, thoracotropic hormone, and juvenile hormone. Plant hormones include ethylene, abscisin, auxins, gibberellins, and cytokinins. "