This gland makes its hormones by combining iodine with the amino acid tyrosine
* Thus, a deficiency of either the 
amino... [DOC] [TLE] hormone - Hormones of the thyroid gland | biochemistry | Britannica ... [PAR] The product of this reaction (active iodine) combines with tyrosine components of 
the ... Thyrotropin attaches to the cells of the thyroid gland and may exert its effect 
by ...