| pyrogens | Substances capable of increasing body temperature; they may be of microbial origin, often polysaccharides and may contaminate distilled water. (12 Dec 1998) |
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| leukocytic pyrogens | Fever producing substance released by leucocytes (and Kuppfer cells in particular) that acts on the hypothalamic thermoregulatory centre. Now known to be interleukin-1. (18 Nov 1997) |
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