mouse unit

mouse unit
(MU or U)
   an unofficial unit of toxicity used in pharmacology. A mouse unit is the dose of a toxin that kills 50% of mice (that is, it is the LD50 dose for mice). Typically the mice are assumed to have a mass of 20 grams, the toxin is administered by intraperitoneal injection, and mortality is measured over a standard period that may vary according to the toxin. The size of the mouse unit (in milliliters or international units) depends on the specific toxin.

Dictionary of units of measurement. 2015.

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