Immune System
Natural killer cells are involved in

allograft rejection
all of these
non-specific killing of virus transformed target cells
tumour rejection

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Immune System
Which of the following is correct for isoantigens?

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

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