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
T cell receptors (or TCR) on CD4+ T cells

recognize peptides not associated with MHC molecules
are secreted out into the environment to bind antigens
recognize peptides associated with MHC class I molecules
recognize peptides associated with MHC class II molecules

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