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    Image of pars distalis atrophy in the pituitary gland from a female F344/N rat in a chronic study
    Pituitary Gland, Pars distalis - Atrophy in a female F344/N rat from a chronic study. The pars distalis (asterisk) is reduced in size and contains a focal aggregate of yellow-brown pigment (likely hemosiderin) within macrophages (arrow).
    Image of pars distalis atrophy in the pituitary gland from a female F344/N rat in a chronic study
    Pituitary Gland, Pars distalis - Atrophy in a female F344/N rat from a chronic study. Higher magnification of Figure 1 shows the reduction in the size of the pars distalis (asterisk) and the focal aggregate of macrophages (arrow) containing yellow-brown pigment (likely hemosiderin).
    Image of pars distalis atrophy in the pituitary gland from a female F344/N rat in a chronic study
    Pituitary Gland, Pars distalis - Atrophy in a female F344/N rat from a chronic study. Higher magnification of Figure 2 shows that the atrophic pars distalis has a paucity of cells and that macrophages containing yellow-brown pigment (likely hemosiderin) are present in the atrophic tissue.
    Image of pars distalis atrophy in the pituitary gland from a female F344/N rat in a chronic study
    Pituitary Gland, Pars distalis - Atrophy in a female F344/N rat from a chronic study. Higher magnification of Figure 3 shows the atrophic pars distalis with the pigment laden macrophages in greater detail.