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Symmetric synapses are immunoreactive for GABA. Shown are examples of symmetric dendritic shaft synapses (indicated by arrowheads) immunopositive for GABA and asymmetric dendritic spine and shaft synapses immunonegative for GABA (indicated by short arrows). Inset, Example of immunopositive symmetric spine synapse. Sh, Shaft synapse; Sp, spine synapse.
