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Mice with knockouts of metallothionein exposed to mercury during development. Metallothionein 1 and 2 knockout mice showed significantly (p< 0.05) greater radial-arm maze choice accuracy impairment resulting from postnatal mercury (HgCl) exposure (Eddins et al., 2008). The choice accuracy measure is entries to repeat, the number of consecutive correct arm entries before the first repeat error.
