Pancreases were harvested from 9-week-old mice that had received lentivirus treatment and DHA plus EPA dietary intervention. Confocal images (A) and quantification (B) of islets expressing only insulin, without α cells. These islets were discovered next to the ductal epithelium in NOD mice treated with lenti-mfat-1 and fed a DHA plus EPA diet (n = 4/group). β cells (insulin, green), α cells (glucagon, red), and nuclei (DAPI, blue) are shown. Scale bars: 50 μm. *P < 0.05 versus the lenti-con group (ANOVA). Images are representative of 3 biological replicates. All values represent the mean ± SEM.