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Ultrastructural identification of synaptic triads. (A–D) Examples of GABA axons (white font A) adjacent to (arrows) unlabeled axons (black font A). The unlabeled axon often formed an excitatory-type (asymmetric) synapse (S, arrowheads) with a common postsynaptic dendrite (D). (E) Zoomed-in view from D, showing close apposition of membranes of the GABAergic and unlabeled axon without intervening glial processes. (Scale bars, 0.5 μm.)
