Under short-duration enflurane anaesthesia, mice fed ad libitum were injected i.c.v. with vehicle (saline solution, 5μl), r/hCRF (0.01, 0.1, 0.5 or 1.0μg), oCRF (0.01, 0.1 or 0.5μg), rat urocortin 1 (rUcn 1: 0.01, 0.1 or 0.5μg), mouse urocortin 2 (mUcn 2: 0.01, 0.1 or 0.5μg), mouse urocortin 3 (mUcn 3: 0.1, 0.5 or 1.0μg) or oCRF9–33OH (0.5μg). Each point represents the mean ±s.e. of cumulative number of pellets for 1h after i.c.v. injection (n= 5–12mice/group). *P<0.05 versus vehicle-treated group (ANOVA); #P<0.05 versus r/hCRF at the same dose.