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In this paper evidence is given for the selective occurrence of the enzyme Diaminopeptidase IV (DAP IV) in human Tμ lymphocytes. This cell population was isolated from human blood and subjected to a cytochemical enzyme reaction. Extending this finding to T-cell leukemias shows that these leukemias can be classified as Tμ cell-derived on the basis of cytochemical tests as well as comparing enzyme polymorphism. [ABSTRACT FROM AUTHOR]