The relative abundance of bacterial population at phylum level (A), and the abundance of Actinobacteria, Bacteroidetes, Firmicutes, Proteobacteria, Tenericutes and Verrucomicrobia in db/+, db/db and db/db+BB mice. Values are mean ± SEM, n=8. p<0.05 was considered significantly different. db/+, Control mice fed a standard diet; db/db, diabetic mice fed a standard diet; db/db+BB, diabetic mice fed a blueberry supplemented diet.