Fig. 7.

Lack of effect of quinpirole on adenylyl cyclase activity in membranes prepared from cultured chicken photoreceptor cells. Adenylyl cyclase activity (AC) in membranes was significantly increased by treatment with either 10 μM forskolin [n=3, **p<0.01 vs. Basal activity] or 120 nM Ca²⁺/calmodulin [n=3, **p<0.01 vs. basal activity]. 10 μM and 100 μM quinpirole failed to inhibit either forskolin-stimulated [n=3, **p<0.01 vs. basal activity] or Ca²⁺/calmodulin-stimulated adenylyl cyclase activity [n=3, **p<0.01 vs. basal activity].