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Phosphatidylinositol‐3‐kinase gamma (PI3Kγ) is a leukocyte‐specific lipid kinase with signaling function downstream of G protein‐coupled receptors to regulate cell trafficking, but its role in T cells remains unclear. To investigate the requirement of PI3Kγ kinase activity in T‐cell function, we studied T cells from PI3Kγ kinase‐dead knock‐in (PI3KγKD/KD) mice expressing the kinase‐inactive PI3Kγ...