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Pre-embedding electron microscopy studies show that SV2B immunoreactivity [arrows in (A,B)] is present in axon terminals forming both asymmetric [arrowheads in (A); layer V] and symmetric [arrowheads in (B); layer V] synaptic contacts. AxT, axon terminal; Den, dendrite; N, pyramidal neuron. Scale bar: 500 nm (A,B).
