The Secondary Signal Needed for TH0 Helper Cells to Differentiate

question 56

Multiple Choice

The secondary signal needed for TH0 helper cells to differentiate into either TH1 cells or TH₂ cells is the cross-link between ________ (on TH0 helper cells) and ________ (on APC cell) .

• A) CD154; CD40
• B) MHC I; B7
• C) CD4; MHC II
• D) CD8; MHC I
• E) CD28; B7

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