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Live mycobacteria have been reported to signal through several pattern recognition receptors (PRR), among them toll-like receptor 4 (TLR4) and TLR2 in vitro. Here, we investigated the role of TLR4 in host resistance to Mycobacterium bovis (BCG) infection in vivo. In vitro, macrophages of TLR4 mutant C3H/HeJ mice infected with BCG expressed lower levels of TNF than controls, and TNF release was further...