A cDNA clone encoding a novel zinc finger protein expressed in lymphoid cells has been isolated. This protein contains 5 repeats of the C2H2 motif previously described in the Drosophila gap gene, Kruppel, which is involved in embryo segmentation. Northern blot analysis showed that the messenger RNA (mRNA) encoding this protein is expressed at high levels in a variety of T-leukemia cell lines, at lower levels in some B cells, but is not observed in nonlymphoid cells. Within the T lineage, the mRNA is found at high levels in both alpha beta and gamma delta T cells. These data suggest that this cDNA, designated Hkr-T1, represents a gene that may contribute to the determination of the differentiation and the specificity within lymphoid cells.
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