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Mean absolute concentrations of NAA, NAAG, and Glu in NAAG metabolism in the ACC and PCC within each AQ group (AQ1 = 28.3%, n = 17; AQ2 = 43.3%, n = 26; AQ3 = 10.0%, n = 9; AQ4 = 18.3%, n = 13), with the AQ1 group taken as a reference or control and the AQ index as a marker of ASD severity. Standardized graph, p < 0.05 considered significantly different. *, **, significant at p < 0.05; 0.01; respectively.
