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Levels of γ-aminobutyric acid (GABA) within the right posterior insula are positively correlated with pressure–pain thresholds in patients with fibromyalgia. Results are shown as a scatterplot of GABA concentrations in relation to slightly intense pressure–pain thresholds in individual patients (solid circles); the regression line is also shown. Correlations were assessed using Spearman's rho. AIU = arbitrary institutional units.
