Effects of glycine, strychnine, and GABA on mvCN presumed interneurons. A–D, Four different spontaneously active non-CL cells. A, B, The suppression of spontaneous activity by glycine was abolished by concurrent strychnine ejection. C, The synaptic activation produced by rvCN stimulation (see the superimposed records expanded below) was abolished by glycine ejection and restored when simultaneously ejecting strychnine. D, Additive effects on spontaneous activity by simultaneously ejecting GABA and glycine, as indicated.