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The transverse sections of the medulla of thymus in the control (a), the medulla of thymus in the 180 mg/kg phenol-treated (b) animals, the cortex of thymus in the control (c), and the cortex of thymus in the phenol-treated (d) animals. The figure shows that in the mice treated with phenol; severe depletion of the lymphoid cells from both cortex and medulla occurred (hematoxylin and eosin stain; a–d ×400)
