Dendrogram representation of the selectivity profile for kinase inhibition by CP-690,550 (1) and stereoisomers 2, 3 and 4 within a panel of 354 kinases. Activity for 1: DCamKL3 = 4.5 nM, Jak1 = 3 nM, Jak2 = 2 nM, Jak3 = 0.7 nM, Tyc2 = 250 nM, Pkn1 = 200 nM, Snark = 420 nM, Tnk1 = 640 nM. Activity for 2: Jak2 = 600 nM, Jak3 = 190 nM, Mst1 = 250 nM, Mst2 = 450 nM. Activity for 3: Jak2 = 270 nM, Jak3 = 180 nM. Activity for 4: Jak2 = 420 nM, Jak3 = 150 nM, Map4K3 = 460 nM, Map4K5 = 790 nM.