|This article does not cite any references or sources. (November 2006)|
D50, the half maximal inhibitory dose, represents the dose of light or ionising radiation that is required for 50% inactivation of a tumor cell population. It can also, in parallel fashion, represent the dose of a drug or toxin necessary to kill 50% of a cellular population.
- LD50, a dose measurement at which half the organisms die
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