Fig. 3. Photomicrographs of semithin sections of the thyroid gland stained with Toluidine Blue-Cresyl Violet in a control animal (a) and an animal exposed to 50 Hz EMF (b). There is a more extensive capillary bed (carets) in b compared with a. Both photomicrographs are of the same magnification. Scale bar, 25 µm.