(a) A schematic representation of a high-power view of thyroid follicles, showing their relationship with capillaries and parafollicular C cells. (b) The histology of normal thyroid tissue. Thyroid follicles of variable sizes can be seen; they contain colloid and are lined by cuboidal epithelium. Haematoxylin and eosin (H and E) stain, magnification ┬┤ 120. By courtesy of Prof. I Doniach.
