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Effects of dietary andrographolide on intestinal histological structure of rice field eel (Monopterus albus). (a), (b), (c), (d) and (e) are AD1, AD2, AD3, AD4 and AD5, respectively (Magnification × 50). The magnification of (f) was 400. The red arrow indicates the villi length, the blue arrow indicates the muscular thickness and the yellow arrow indicates the goblet cell. The upper left is the scale bar.
