Immune System
Natural killer cells are involved in

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

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Immune System
Which of the following is correct for isoantigens?

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

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