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Effects of dopamine and dopamine ligands on horizontal cell membrane potential in the day and night
| Test drug | Membrane potential change (mV) | |
|---|---|---|
| Day | Night | |
| Dopamine (100 nm) | −1.7 ± 2.0 (8) | −5.8 ± 3.1 (9) |
| Quinpirole (1 μm) | −2.1 ± 1.8 (6) | −6.4 ± 2.7 (12) |
| Spiperone (1 μm) | 4.1 ± 1.6 (16) | 0.7 ± 0.6 (7) |
| SCH23390 (10 μm) | 0.6 ± 0.5 (9) | 0.4 ± 0.7 (6) |
Values are means ± s.e.m. Numbers in parentheses in the column on the right indicate numbers of cells tested.
