Definitions

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Natural killer cells (NK cells)search for term: A type of lymphocyte. Like cytotoxic T cells, NK cells attack and kill tumour cells and protect against a wide variety of infectious microbes. They are "natural" killers because they do not need additional stimulation or need to recognize a specific antigen in order to attack and kill. Persons with immunodeficiencies such as those caused by HIV infection have a decrease in natural killer cell activity.
Non-nucleoside reverse transcriptase inhibitor (NNRTI)search for term: A class of antiretroviral drugs, for example, Nevirapine
Nosesearch for term: Part of the human body used for smelling
Nucleoside reverse transcriptase inhibitors (NRTI)search for term: A class of anti- retroviral drugs, for example, Retrovir (AZT)

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