First, a cluster of genes appears to be "implicated" in about 5-8 percent of autism cases. More than that, though, the latest research appears to show girls are more resistant to autism-related genetic tendencies than boys.
Second, concern over chemicals (NOT mercury compounds) and autism continues to grow. (Note a chemical industry consultant whose own grown kids have concerns about chemicals.)
And the NIH notes that autism seems to blur/lessen distinctions between different brain areas. Causes on this are surely some way away from being narrowed down.
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