thyroid follicle

What Protein Is Stored In The Thyroid Follicle? Thyroglobulin is stored extracellularly in the lumen of the thyroid follicle, where it is virtually the sole occupant (Fig. 1). When the stored hormone is needed, Tg is retrieved by pinocytosis and ingested by the cell, where it fuses with lysosomes and is digested, and the hormone