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Natural Killer (NK) cells are large granular cytotoxic lymphocytes that play a role in the innate immune response against tumour cells and virally infected cells. In pathogen-free chickens, these cells are thermolabile at 37oC and resistant to treatment with anti-B or anti-T cell anti-sera. This is in contrast to humans and rats, where NK cells are resistant to temperature manipulation for 30 or 60 minutes. While some reports suggest that NK cells are adherent and phagocytic, others suggest they are non-adherent a...