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IRAK3 is a novel member in the IRAK/Pelle family. IRAKs associate with IL-1/Toll receptors after IL-1 or LPS stimulation and play a central role in IL-1R/TLR mediated inflammatory responses. Interleukin-1 (IL-1) and lipopolysaccharide (LPS)induces cellular response through IL-1 receptor (IL-1R) and Toll like receptors (TLR). IL-1 receptor associated kinase (IRAK and IRAK2) mediates the activation of NF-kB by IL-1/Toll receptors (Wesche H et al.1999,Muzio M et al.1997), which is a pivotal transcription factor mediating inflammatory and immune response. A novel member in theIRAK/Pelle family was recently identified and designated IRAK-M (Cao Z et al.1996). IRAKs associate with IL-1/Toll receptors after IL-1 or LPS stimulation and thedominant negative mutants of IRAKs inhibit IL-1 orLPS induced NF-kB activation. Members inIRAK/Pelle family play a central role in IL-1R/TLRmediated inflammatory responses to cytokine IL-1and LPS.