Fig. 1From: Biomarkers for isolated congenital heart disease based on maternal amniotic fluid metabolomics analysisMetabolomics analysis between the two groups. A, PCA of all samples, where the X-axis represents the first principal component and the Y-axis represents the second principal component. B, PCA 3D map of differential grouping. C, OPLS-DA score map. D, OPLS-DA model validation diagramBack to article page