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

interleukin
actin
HLA
CD8

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Immune System
Which of the following statements is false regarding B cells?

B one marrow stem cells migrate to the thymus and develop into B cells
B cells that recognize high concentrations of antigens (self) in the absence of other signals undergo apoptosis in the bone marrow
B cells synthesize antibodies and put them on their cell surface
B cells can undergo class switching and produce a different antibody type

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