Fig. 2From: Plasma metabolomic profile in orthostatic intolerance children with high levels of plasma homocysteineMetabolite classification analysis and volcano plots. (a) The pie chart shows 14 superclasses. (b, c) Volcano plots of positive ion mode and negative ion mode. Red points represent upregulated metabolites satisfying FC > 1.5 and P < 0.05, blue points represent downregulated metabolites satisfying FC < 0.67 and P < 0.05, and black points represent nondifferential metabolites. C: Control group. OI: OI groupBack to article page