Fig. 4From: Copper oxide nanoparticle toxicity profiling using untargeted metabolomicsNumber of significantly regulated features (p < 0.05) calculated using limma followed by Benjamini-Hochberg correction for multiple testing. (a) reversed-phase HPLC & positive ionization (RP_pos) (b) reversed-phase HPLC & negative ionization (RP_neg) (c) HILIC & positive ionization (HILIC_pos) (d) HILIC & negative ionization (HILIC_neg)Back to article page