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Arsenic methylation. Arsenite (AsIII) is methylated to form monomethylarsonic acid (MMAsV) by arsenic methyltransferase (AS3MT) using the methyl donor S-adenosylmethionine (SAM). MMAsV is subsequently reduced to monomethylarsonous acid (MMAsIII) and methylated to form dimethylarsinic acid (DMAsV).
