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Receiver operating characteristic (ROC) curve of (A) creatine (Cr), nitric oxide (NO), 5'-nucleotidase (5'-NT), ammonia (NH3), gamma-aminobutyric acid (GABA), and glutamate:glutamine (Glu:Gln) ratio and (B) of glutamate dehydrogenase (GDH), adenosine deaminase (ADA), and urea in autistic group.
