Figure 1

a) and b) CRE-SPAP production in forskolin-stimulated CHO-H3-SPAP cells in response to S-α-methylhistamine, N-α-methylhistamine and burimamide in the absence a) and following pre-incubation with PTX b). The figures are normalised to maximum forskolin stimulation where basal = 0 and maximum forskolin stimulation = 1. Data points are mean ± s.e.m. of triplicate values from a single experiment and are representative of a) 6 and b) 3 separate experiments.