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Tissues undergoing growth (to which cell division is important) are especially vulnerable to methylmercury, since “methylmercury is known to inhibit cell division by causing metaphase arrest,” according to a WHO publication (Sect. 9). Abnormal neuronal migration (as an effect of methylmercury exposure) is especially significant to discussion of origins of autism, since disorganization of brain cells, which could result from defective migration, was found in a 2014 study to be normally present in brains of children with ASD.
Mercury and other contaminants in common loons breeding in Atlantic Canada. Burgess NM, Evers DC, Kaplan JD. Environ. Sci. Technol. 2010