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Three types of synapses including unidirectional synapses (asterisk and P), bidirectional synapses (arrows) and combined type synapses (dotted-line circle) in neuropil of cerebral ganglia. The close association of an internal membrane compartment (arrowhead) with the membrane of neurite. P, postsynaptic profiles; asterisk, presynaptic profiles; SV, small vesicles; N, neurite; M, mitochondrion.
