Original sentence: It has been hypothesized that a MT disorder explains several symptoms of autism (the mercury poisoning hypothesis), but a 2006 study found that autistic children did not differ significantly from normal children in levels of MT or antibodies to MT
Edited sentence: Heavy metal toxicity is considered to be a possible etiology of autism, and dysfunction of MT synthesis and activity may play a role in this.However, MT dysfunction has not specifically been linked to autistic spectrum disorders.Many heavy metals, including mercury, lead, and arsenic have been linked to symptoms that resemble the neurological symptoms of autism.One small study in 2006 found that autistic children did not differ significantly from normal children in levels of MT or antibodies to MT.Research in this area is ongoing, however