A Helper T Cell That Secretes ______ Induces a Switch $\alpha$

Multiple Choice

A helper T cell that secretes ______ induces a switch in the adjacent B cell from IgM synthesis to one of the IgG classes.

A) IFN- $\alpha$
B) IFN- $\gamma$
C) IFN- $\beta$
D) interleukin-1
E) glucagons