Fig. 4. Formoside induces an electrophysiological response in zebrafish cDNA library-expressing oocytes. Formoside (Form) caused a response in library-expressing cells after activation of the G_s pathway with isoproterenol (Iso; A). No responses to formoside or octanal (Oct) were seen in oocytes without library (B). Note the difference in time scale between A and B. Inset shows the response to isoproterenol in B on the same time scale as A.