Thymocytes from WT and itk-/- mice were stimulated with 10 ng/mL PMA and 1 μg/mL ionomycin for six hours, and then stained with CD1d-tetramer and antibodies against CD4, CD8, HSA, IFNγ, and Eomesodermin. Dot-plots are gated on CD4SP CD1d-tetramerneg HSAlow thymocytes, and show IFNγ versus Eomes staining. Results are representative of two independent experiments involving 2-4 mice per group.