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Parallel comparison of results from Brand B and Milli-Q based on the MNP quantification analysis using fluorescent polystyrene (PS) beads as the internal standard. From Left to Right, the relative number abundance of polyethylene terephthalate (PET), polyvinyl chloride (PVC), and polyamide (PA) plastic particles compared to the added PS beads. Error bars, mean ± SEM. Data are originated from SI Appendix, Fig. S20 (2). P values are calculated from generalized linear mixed model analysis.
