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A comparative electron histochemical investigation was made of ATPase and 5'-nucleotidase activities in isolated cells and in cryostate sections of the rat thymus after various pretreatment. A most optimal demonstration of intracellular ATPase and 5'-nucleotidase activities was possible in non-fixed isolated cells whose cytoplasm was partially or completely destroyed in the process of homogenization. ATPase and 5'-nucleotidase activities were revealed in the nuclear chromatin and in interchromatin ribonucleoproteins, perinuclear space, endoplasmic reticulum and Golgi complex. ATPase activity on the plasma membrane was revealed in the best way in isolated cells after glutaraldehyde prefixation.
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