Body weight (A), fed blood glucose (B), and baseline renal afferent arteriole (AA) diameter (C) in 18-wk-old db/m and db/db mice. Body weight, fed blood glucose, and AA diameter of db/db mice (n = 55, 22, 38) were significantly larger than those of db/m mice (n = 58, 26, 37). *P < 0.05, db/m vs. db/db.