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Figure 7. (A) Histological images of intestines and (B) quantified intestinal goblet cell densities in zebrafish exposed to control, MPs, OTC, and MP-OTC, respectively [n=6 for both analysis for each experimental group, and randomly selected images are presented as representatives for (A)]. The images of intestines presented in (A) were stained with H&E. The magnification and scale bar were 200× and 100μm for (A), respectively. Goblet cells are indicated by black arrows in (A). The corresponding numeric data for (B) are provided in Table S10. 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: H&E, hematoxylin and eosin; MP-OTC, microplastics and oxytetracycline; MPs, microplastics; OTC, oxytetracycline; SE, standard error.