Immune System
Natural killer cells are involved in

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

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Immune System
Polymorphonuclear leukocytes (or PMNs)

can be attracted to the site of an infection following activation of complement
are derived from bone marrow stem cells
are a type of phagocyte that can engulf and kill bacteria
All of these

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