Immune System
Which is not an antigen-presenting cell (or APC)?

B cell
Dendritic cell
Polymorphonuclear leukocyte (or PMN)
All of these

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Immune System
Which of the following is correct for isoantigens?

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

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