If a TH1 response has been generated against an extracellular bacteria that has also infected macrophages, which of the following interactions will occur initially that allow the activated TH1 cell to assist the macrophage kill this bacteria?

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Answer

The phosphorylation of CD4 on the surface of the T cell

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The binding of the TCR to peptide:MHC class II on the macrophage

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The binding of CD40 on the T cell to CD40L on the macrophage

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The release of IFN-γ by the activated TH1 cell

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If a TH1 response has been generated against an extracellular bacteria that has ...

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