Figure 1.
(a) Time course and (b) effect of pertussis toxin (PTx; 100 ng ml−1) on quinpirole acidification rate responses in CHO cells expressing hD2, hD3 or hD4 receptors. Data are from a single experiment representative of at least two tests. Exposure to quinpirole indicated by the boxes. Data for hD3 control cells in (b) offset by −40 μV s−1 for clarity.