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Representative micrographs of immunohistochemical staining showing localization of thyroid peroxidase (TPO), sodium iodide symporter (NIS), and thyroglobulin (Tg) in the thyroid of sham-operated (SO), orchidectomized (Orx) and orchidectomized cholecalciferol-treated (Orx + Vit. D3) rats. C, colloid; fe, follicular epithelium; cc, CT-producing cells (C cells); bl, basolateral NIS immunostaining; cy, cytoplasmic NIS immunostaining; bw, blood vessel.
