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what are the first and second signals for sctivation A. Antigen presenting cell 2nd signal B....

what are the first and second signals for sctivation
A. Antigen presenting cell 2nd signal
B. Cd4+ T cell 1st signal
C. Cd4+ t cell 2nd signal
D. B cell 1st signal
E. B cell 2nd signal
F. CD8+ T cell 1st signal
G. CD8+ T cell 2nd signal
H. Third signal for any cell
word bank: cytokine help, CD40L/CD40, DANGER/TLR, MHC 1+peptide, MHC 2+peptide, whole antigen, CD80/86&CD28
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