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. 1997 Jul 1;110(1):45–58. doi: 10.1085/jgp.110.1.45

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The GABA_B-CACAR modulates a dihydropyridine-sensitive barium current. The top trace shows recordings from one ganglion cell in which the barium current was evoked by a voltage ramp. The current was suppressed by 50 μM nimodipine or 5 μM CACA. In the presence of nimodipine, the effect of CACA was occluded. The chart shows data on a population of nine ganglion cells in which CACA suppressed the barium current and another set of ten ganglion cells in which nimodipine reduced the barium current and largely occluded the action of CACA.