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    Image of ulcer in the tongue from a female F344/N rat in a chronic study
    Tongue - Ulcer in a female F344/N rat from a chronic study. A portion of the keratinized squamous epithelium of the tongue has been lost, exposing the underlying lamina propria.
    Image of ulcer in the tongue from a female F344/N rat in a chronic study
    Tongue - Ulcer in a female F344/N rat from a chronic study (higher magnification of Figure 1). Inflammatory cells are present on the surface of the ulcer and within the underlying lamina propria.