Fig. 6

An electron micrograph of thyroid follicular cells of TBT-treated rat (Group II). It is showing high columnar cells with oval nuclei (N). The cytoplasm reveals multiple dilated profiles of rough endoplasmic reticulum (r). Some of the mitochondria appear normal (m) while other exhibit disrupted cristae (m1). Notice: (mv); microvilli, (L); Lysosomes