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Principal component analysis (PCA) score plots of the gene expression (A) and metabolomics profiles ((B) in positive ion mode and (C) in negative ion mode) of BEAS-2B cells treated with H2O and FeOxNPs. Symbols in the PCA plots indicate individual repeats of BEA-2B cells of control group (circle 
) or exposed to Fe3O4 B (triangle 
), FeOx-mix A (square 
), FeOx-mix B (plus 
), and FeOx-mix C (plus 
).
