Fig. 1

a, The fast glucose levels after STZ injection of model group and MBBP treat group; b, Intraperitoneal glucose tolerance test (IPGTT). The mice were fasted for 12 h, and the baseline blood glucose was measured at 0 min, and then 2 g glucose/kg body weight was injected intraperitoneally. Glucose levels were tested at regular intervals of 15, 30, 60, 90 and 150 min; c, Quantification of the area under the curve (AUC) from the IPGTT; d, Histopathological examination of pancreas by H&E staining; e, Immunofluorescence examination of insulin in pancreas by Alexa Fluor 488 (green)