Quantitative analyses of interstitial collagens after UUO in wild-type mice with either Agtr1–/– marrow or Agtr1+/+ marrow. (a) Interstitial collagen index assessed by point-counting method on Masson trichrome–stained sections at day 5 (left) and day 14 (right) after UUO. (b) Collagen content as percentage of total protein in kidney at day 14 after UUO. Black bars represent mice with Agtr1–/– marrow; white bars represent mice with Agtr1+/+ marrow. Data are expressed as means ± SEM.*P < 0.005 for mice with Agtr1–/– marrow versus mice with Agtr1+/+ marrow.