Sub-synaptic characterization of GABAAR and GlyR domains. (H-J) Detections of GABAARs but not GlyRs at the same SSDs were reduced after 4-AP treatment (KS, p < 0.0001 in H and J, p < 0.01 in I). Number of synapses: n = 439 in TTX, n = 531 in 4-AP condition, from three independent experiments. 