part_of thyroglobulin processing pathway thyroid hormone biosynthetic pathway 2016-02-19T09:46:16Z PW:0002521 SMP:00716 The major thyroid hormones thyroxine (T4) or tetraidothyronine and triiodothyronine (T3) are the major thyroid hormones produced via processing of thyroglobulin precursor. T3 is the active hormone and is derived from T4 by the action of deiodinases. pathway vpetri