In the BDE-47 treatment group, it was found that the follicle structure was deformed in the middle and edge of the gland, the follicle was flat or low columnar, some of the epithelial cells of the follicle were necrotic and fell off into the cavity, the gap between the follicles became larger, and some of the follicles with colloids gathered in the middle were darker (Fig. 1c).<br>
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