Figure 4.

Mean log concentration-response curves for the inhibitory effects of ATP on field stimulation induced contractions in rat prostatic preparations in the absence or presence of (A) suramin (100 μM) and (B) reactive blue 2 (5 μM). Results are expressed as the percentage inhibition of basal control electrical field stimulation-induced responses. Each point represents the mean±s.e.mean of six experiments. P values are for the concentration×treatment interaction of a 2-way repeated measures ANOVA. The histogram columns represent the mean force developed by control tissues and in the presence of antagonist prior to the addition of agonists. Vertical bars represent s.e.mean.