Cooperative enhancement of DSE by combined activation of M1 and group I mGluRs. A, Representative data showing enhancement of DSE by combined application of 5 μm DHPG and 0.5 μm oxo-M. Data are shown in a manner similar to Figure 6B. Calibration: 100 pA, 10 ms. depol., Depolarizing pulse. B, Summary bar graph showing enhancement of DSE by 5 μm DHPG alone, 1 μm oxo-M alone, coapplication of 5 μm DHPG and 0.5 μm oxo-M, and coapplication of DHPG and oxo-M in the presence of 1 μm pirenzepine (Prz).