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IRAK-1 is a critical modulator regulating innate immunity signaling processes. However, the physiological substrates for IRAK-1 remain poorly defined. In this report, we have demonstrated that IRAK-1 is a kinase responsible for the constitutive phosphorylation and inactivation of the Nuclear Factor of Activated T-cell (NFAT). Expression of IRAK-1 suppressed NFAT reporter activity. Correspondingly,...