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Figure 3 Increase in basal or (–)isoprenaline (10 µmol/liter)-stimulated cAMP-levels upon incubation of CHW-beta1 cells with the indicated concentrations of rabbit, mouse or human anti-beta1-ECII (open symbols), or rabbit anti-beta1-C/-N (filled circles/triangles). IgG-preparations from healthy subjects served as a control (filled diamonds). Error bars indicate the mean ± SD of three experiments.