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Figure 8. MDA contents in the intestines of zebrafish after 28-d exposure to control, MPs, OTC, and MP-OTC, respectively (n=6 for each experimental group). The MDA content was measured with a commercial kit (BC0025; Solarbio) using a microplate reader (Multiskan GO; Thermo Scientific) and standardized with the protein content of the sample. The corresponding numeric data are provided in Table S11. Data (means±SEs) with different superscripts above were significantly different at p<0.05 (one-way analysis of variance and Tukey’s post hoc tests). Note: MDA, malondialdehyde; MP-OTC, microplastics and oxytetracycline; MPs, microplastics; OTC, oxytetracycline; prot, protein; SE, standard error.