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(A) shows Se nanoparticles in negative ionization mode, (B) selenite in negative ionization mode, (C) Se nanoparticles in positive ionization mode and (D) shows selenite in positive ionization mode. SeNP designates Se nanoparticles, and NaSe designates sodium selenite. The components designate principal components 1 and 2 of the PLS-DA analyses.
