Follicular cells convert thyroglobulin, a protein found in follicles into 2 iodine containing hormones: triiodothyronine or T3 , and thyroxine or T4 .

滤泡细胞转化滤泡当中的白成为两种含碘激素：碘原氨酸，又称T3；以及素，又称T4。