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

actin
CD8
HLA
interleukin

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Immune System
Which of the following is correct for isoantigens?

They are antigens found in some members of a species
They are antigens found in all members of a species
They are antigens found in all members of different species
They are antigens found in some members of different species

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