After the determination of MTC, the hyperglycemic zebrafish model was established as described in section “2.8.1. Determination of maximum detection concentration.” The zebrafish without any treatment was taken as normal group. The zebrafish treated with 500, 1,000, and 2,000 μg/ml of E70 PRA extract were taken as treatment groups, while the zebrafish treated with 18 μg/ml pioglitazone (PGTZ) was used as positive control. The blood glucose level (G) was determined with blood glucose meter, the hypoglycemic effect was calculated as follows:
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