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(A) Pituitary microadenoma in an aged cynomolgus macaque. H&E. (B) Pituitary adenoma in a twenty-five-year-old cynomolgus macaque. Immunohistochemistry for adrenocorticotropic hormone; hematoxylin counterstain. (C) Gonadotroph hypertrophy in the pars distalis of an adult ovariectomized cynomolgus macaque. H&E. (D) Follicle-stimulating hormone immunostain, hematoxylin counterstain.
