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    Image of hyperkeratosis in the tongue from a female F344/N rat in a chronic study
    Tongue - Hyperkeratosis in a female F344/N rat from a chronic study. The keratin layer on the surface of the tongue is thickened (arrow).
    Image of hyperkeratosis in the tongue from a female F344/N rat in a chronic study
    Tongue - Hyperkeratosis in a female F344/N rat from a chronic study (higher magnification of Figure 1). The hyperkeratosis is orthokeratotic, lacking nuclei.