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Graded responses to electrical stimulation. Five GAD2 interneurons in layer 2/3 of the somatosensory cortex of an hVOS::GAD2 mouse are indicated in the high-resolution (480 × 640) CCD image (top left) and in the CCD-SMQ (80 × 80) camera image below. Five trial averages show that increasing stimulus current from 50, 100, 150, to 200 μA increased response amplitudes to varying degrees in the different cells. Open circle represents site of stimulation.
