), slices were incubated in the absence (control) or in the presence of CPA (000 nM) for 00 min. After this period incubation continued for 00 min in the presence of rolipram (00 *μ*M) and in the absence (control) or in the presence of WIN00000-0 (00 *μ*M). Then incubation proceeded in the presence of forskolin (00 *μ*M) for a further 00 min period. In experiments where CPA was added 00 min before forskolin (