Immune System
Macrophages are professional antigen- presenting cells. The protein molecule through which they present antigen in human is

CD8
actin
HLA
interleukin

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Immune System
Numerous antibodies can be prepared, against one antigen, each binds to unique epitopes. How is this antibody diversity generated?

By rearrangements of the DNA encoding the variable regions of the heavy and light chains
Both (a) and (b)
By the combination of different heavy and light chains that form the antigen binding site
Antibody proteins can physically change their shape to bind different epitopes

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