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Proliferation analysis of mouse thyroid glands. Mouse thyroids were immunostained for Ki-67, which is expressed in the active phases of the cell cycle. Immunostaining was rare in wild-type mice and more prominent in the PPFP, ThyPten+/−, and PPFP;ThyPten+/− mice. Arrows point to positive nuclei. Sections were counterstained with hematoxylin.
