this study provides new cytochemical evidence demonstrating the heterogeneity of leu-2+/t8+ cells , and indicates that the population with the suppressor phenotype and function ( leu-15+/lyt-1- , gl morphology ) displays low or absent 5'nt activity , whereas the population composed of cytotoxic cell precursors ( leu-15-/lyt-1+ , nongranular morphology ) has high 5'nt activity .
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