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The 18-week-old control thyroid gland. (A) Description of the central and peripheral zones of the thyroid gland in the longitudinal and transverse planes. (B, C) Conserved zonal variation in the thyroids of 18-week-old control mice. (B) Hematoxylin and eosin–stained sections of thyroid from an 18-week-old control mouse in the central and peripheral zones. (C) Mean area (±standard deviation, n=2) of follicles in the central and peripheral (pph) zones of an 18-week-old mouse thyroid.
