immune system
• peritoneal macrophages from mice homozygous for this mutation produce no type I interferon (IFN) in response to lipopolysaccharide (LPS), a Toll-like receptor (TLR) 4 ligand
• homozygous mutant macrophages produce normal levels of type I INF in response to poly I:C, a TLR3 ligand
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• homozygous mutant peritoneal macrophages produce little tumor necrosis factor (TNF) alpha in response to the TLR4 ligand LPS
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