Five canine cutaneous histiocytomas were studied by electron microscopy and esterase cytochemistry. The tumor cells contained irregular nuclei, characteristic lysosomal granules, and perinuclear microfilaments. The cells showed activity with alpha-naphthyl acetate esterase stains. These characteristics are evidence that this tumor originates from the mononuclear phagocyte system.
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Glick et al. (1976) studied this question.
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