Glossary N
Glossary N
Natural experiment refers to an experiment in which comparisons are made between pre-existing conditions or treatments .
Natural killer (NK) cell is defined as a type of lymphocyte that attacks invading organisms; type of leukocyte that destroys certain kinds of tumor cells and cells infected with viruses
Natural killer cells are cells that circulate in the body, playing a role in different immune responses and especially in destroying diseased cells by injecting them with toxic chemicals.
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- Natural language categories : Natural language categories are language terms that include a wide range of exemplars; most natural language categories are hierarchical in nature, as in animal; canine; dog