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
Correct Answer:
Verified
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