Autoradiograms (A) and quantitative densitometric analysis (B) of specific B
R binding sites in the grey matter of lumbar spinal cord of rats treated with capsaicin (15 and 50 mg/kg, s.c.) or vehicle, 24 h earlier. Data represent the means ± S.E.M. of n rats per group. Comparison with vehicle (*) is indicated by ** P < 0.01.