Stafia-1 is a potent STAT5a inhibitor ( K i =10.9 μM, IC 50 =22.2 μM). Stafia-1 displays high selectivity over STAT5b and other STAT family members In Vitro Stafia-1 shows at least 9-fold selectivity over STAT5b and higher selectivity against other STAT family members. MCE has not independently confirmed the accuracy of these methods. They are for reference only. Form:Solid IC50& Target:STAT5a 10.9 μM (Ki) STAT5a 22.2 μM (IC 50 )