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- _6 value "CD2 signaling of human PBMC results in activation of the -3.6-kb IFN-gamma promoter, whereas mutation of the -3.6-kb STAT5 site attenuates promoter activity. Functional activation is accompanied by STAT5A but little STAT5B nucleoprotein binding to the IFN-gamma STAT5 site, as determined by competition and supershift assays. STAT5 activation via CD2 occurs independent of IL-2. Western and FACS analysis shows increased phospho-STAT5 following CD2 signaling. AG490, a tyrosine kinase inhibitor affecting Jak proteins, inhibits CD2-mediated IFN-gamma mRNA expression, secretion, and nucleoprotein binding to the IFN-gamma STAT5 site in a dose-dependent fashion." provenance.