Viscosity of gastric secretions. Rats and mice were injected with hTFF2 (rats, n=18; mice, n=13), hTFF3 (rats, n=6) or 0.9% saline (control: rats, n=20; mice, n=7) i.v. and s.c. and the stomach was ligated. Four hours after injection, the stomach contents were collected and the viscosity measured. Viscosity is expressed in nm2 s−1 (individual values and median). **P<0.01, ***P<0.001.