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    Image of renal tubule epithelium atypical tubule hyperplasia in the kidney from a male F344/N rat in a chronic study
    Kidney, Renal tubule - Atypical tubule hyperplasia in a male F344/N rat from a chronic study. Atypical tubule hyperplasia is confined to one tubule and is characterized by an increase in cellularity and cell size, cytoplasmic basophilia, nuclear enlargement, and circumferential expansion.
    Image of renal tubule epithelium atypical tubule hyperplasia in the kidney from a male F344/N rat in a chronic study
    Kidney, Renal tubule - Atypical tubule hyperplasia in a male F344/N rat from a chronic study. This larger focus of tubule hyperplasia contains three cross sections of presumably the same tubule.
    Image of renal tubule epithelium atypical tubule hyperplasia in the kidney from a female F344/N rat in a chronic study
    Kidney, Renal tubule - Atypical tubule hyperplasia in a female F344/N rat from a chronic study. Early proliferation of epithelial cells indicates atypical tubule hyperplasia.