What is a natural killer cell?

A Moretta, C Bottino, MC Mingari, R Biassoni… - Nature …, 2002 - nature.com
Nature immunology, 2002nature.com
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Natural killer cells have been arbitrarily defined using a number of different phenotypic and functional criteria. We asked Lorenzo Moretta if we have truly discovered the core identity of this critical player in eliciting immune responses.
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