Comparative gene expression analysis (PIQOR Immunology) Human Vg9Vd2 T cells amplified (soluble phosphoantigen) from ex vivo fresh PBMC of healthy human donors 3 weeks of culture in the presence of either IL-2 or IL-2+IL-21 Total RNA extracted from resting purified gamma delta T cells PIQOR microarrays PIQOR Human Immunology Service Topic-defined microarrays (Miletnyi Biotec) Comparison IL-2+IL-21 (Cy5) versus IL-2(Cy3) T7-amplified RNA