Fig 1: Vδ2 T cells from the STK4-deficient patient, displaying features of both naïve and effector cells, high levels of CD56 and CD57 expression, and mildly impaired proliferation upon T-cell activation. (A) CD27+CD45RA- T cells were the major subset of Vδ2 T cells. Histogram of CD56 and CD57 expression on Vδ2 T cells. (B) CFSE proliferation assay with CD4+ T T cells and Vδ2+ T cells incubated with 50 ng/ml IL-2 plus 250 ng/ml PHA or 1:100 T cells anti-CD3/CD28/CD2 T-cell activator