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. 2016 Oct 7;10:186. doi: 10.3389/fnbeh.2016.00186

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Copyright © 2016 Held, Berz, Hensgen, Muenz, Scholl, Rössler, Homberg and Pfeiffer.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution and reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Transmission electron micrographs showing the ultrastructure of microglomerular synaptic complexes in the LBU (A,A’) and the MBU (B,B’) of the lateral complex (LX). (A) The complex consists of one large profile (LP) enclosing many small profiles (SPs). The LP contains clear vesicles (cVs), some large dense core vesicles (dcVs) and many mitochondria (M) and forms numerous synaptic connections with the SP (arrowheads). A glial sheath (GS) is wrapped around the complex. It is located in proximity to two nuclei of other cells (N). (A’) Drawing of the complex in (A) shows the borders of the profiles, organelles and synaptic connections. All parts of the LP are shown in white and the SP in gray. (B,B’) The structure of the complex in the LBU is similar to the one in the MBU: one LP encloses many SP. Scale bars = 1 μm.