Latest study on urinary porphyrins in Autism

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this is the latest study recap:

.....Elevated porphyrin levels among AU children were not associated with measures of past or current mercury exposure, and a porphyrin pattern consistent with that seen in adults with prolonged mercury exposure was not apparent. These findings suggest that disordered porphyrin metabolism may be a salient characteristic of autism and encourage further investigation of genetic, metabolic and/or environmental factors that may explain this association.

http://ehp03.niehs.nih.gov/article/info:doi/10.1289/ehp.0901713