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Electron micrographs illustrating the localization of I-1 in the neuropil of PFC area 9. DAB label (arrows) was identified in spines (A), dendritic shafts (B), axon terminals (C), pre-terminal axons (D) and glia (E). The labeled spine in A is receiving an asymmetric synapse, and the labeled axon terminal in C is making a perforated asymmetric synapse. Scale bar is 500 nm for A, C and D and 750 nm for B and E.
