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The ultrastructure of neuropil containing three types of synapses. The bidirectional synapses (arrows) with electron-dense core vesicles (DCV)/small vesicles (SV) in both neurites. Dottedline circle lables combined type synapses. The close association of an internal membrane compartment (arrowhead) with the membrane of neurite. P, postsynaptic profiles; asterisk, presynaptic profiles; M, mitochondrion.
