Below is an extended transcript excerpt from the Autism Now series, edited for length, relevance and clarity, with Dr. David Amaral, research director at the MIND Institute at the University of California, Davis, on the causes of autism.

As part of our Autism Now series of reports, below is an extended transcript excerpt, edited for length, relevance and clarity, with Irva Hertz-Piccotto, chief of the division of environmental health at U.C Davis and a faculty member at the…