A cell-permeable 3′-pyridyl oxindole compound that acts as a potent and reversible inhibitor of JAK3 (IC50 = 27 nM)and displays ~16-fold greater selectivity over JAK2. Binds to the enzyme active site and prevents IL-2-induced cellular phosphorylation of JAK3 and STAT5. Inhibits IL-2-induced cell proliferation (IC50 = 760 and 250 nM for mouse CTLL and human T-cells, respectively) and alleviates oxazolone-induced ear odema in mouse with an efficacy comparable to that of Dexamethasone (Cat. No. 265005).http://www.creative-enzymes.com/product/JAK3-Inhibitor-VI_3024.html