Which of the following cytokine is releases from virus-infected cells soon after infection?
A. TGF-β
B. IL-10
C. IFN-α
D. IL-2
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Which type of immunoglobulin can cross placenta?
A. IgD
B. IgE
C. IgG
D. IgM
At secondary immune responses, which kind of immunoglobulin has the highest concentration in serum?
A. IgD
B. IgE
C. IgG
D. IgM
Which type of antigens have immunologic memory and isotype switching?
A. TI-1 antigens
B. TI-2 antigens
C. TI antigens
D. TD antigens
Which cell type can secrete antibodies?
A. Pre-B cells
B. Mature T cells
C. Mature B cells
D. Plasma cells
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