Three types of glycine response in spontaneously spiking CWCs. A–C, Examples of excitatory (A), mixed (B), and inhibitory (C) responses to a glycine puff during spontaneous activity. The duration of the glycine puff is indicated with a bar, and the glycine concentrations were 0.5, 0.5, 0.5, 0.5, 2, and 2 mm for the six cells in left-to-right, top-to-bottom order.