Choose the correct answer
T follicular helper cells within germinal centres of lymph nodes have which function(s)?
Induce immunoglobin isotype switching
Induce B cell affinity maturation
Produce IFN-γ to activate macrophages;
Prduce IL-17 and Il-22 to recruit phagocytes
Both B-cell isotype switching and B-cell affinity maturation
Both IFN-γ and Il-17 and Il-22 production
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