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    Image of involution in the thymus from a female Harlan Sprague-Dawley rat in a chronic study
    Thymus - Involution in a female Harlan Sprague-Dawley rat from a chronic study. The lymphocyte density is significantly decreased (arrow), and the corticomedullary junction is indistinct. Adipocytes infiltrate the capsule.
    Image of involution in the thymus from a female Harlan Sprague-Dawley rat in a chronic study
    Thymus - Involution in a female Harlan Sprague-Dawley rat from a chronic study (higher magnification of Figure 1). Small aggregates of plasma cells (arrows) are present within the medulla, and medullary epithelial cells are prominent.
    Image of involution in the thymus from a male Wistar Han rat in a chronic study
    Thymus - Involution in a male Wister Han rat from a chronic study. Adipocytes infiltrate the periphery of the thymus, and the medullary regions are hypercellular (arrows).
    Image of involution in the thymus from a male Wistar Han rat in a chronic study
    Thymus - Involution in a male Wister Han rat in a chronic study. A focal round area of B-cell hyperplasia is present in the medullary region (arrows).