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. 2020 Feb 3;225(2):705–734. doi: 10.1007/s00429-020-02029-2

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© The Author(s) 2020

Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 4 — GABAergic neurons of the medial septum innervate hippocampal trilaminar cells. a Viral injection site and expression of GFP (top right, single optical section, 20.8 μm) together with labelled GABAergic neurons in the medial septum of a VGAT^Cre mouse (GFP^VGATCre+ ; bottom, maximum intensity projection, z stack, height 13 μm). b–d GFP^VGATCre+ medial septal axons in areas CA1 and CA3 in apposition to cell bodies and dendrites of M2+/Netrin-G1+ neurons (maximum intensity projections, z stacks, heights 35.9 μm, 16.2 μm and 27.2 μm). e–h M2+/Netrin-G1+ neurons postsynaptic to GFP^VGATCre+ medial septal boutons innervated by mGluR8a+ terminals identifying them as trilaminar cells (maximum intensity projections, z stacks, heights 10.8 μm, 5.2 μm, 5.4 μm and 4.9 μm). Note mGluR8a expression in some of the GFP^VGATCre+ medial septal input terminals (arrowheads). In most neuronal somata we detected high levels of lipofuscin (triangles). MS, medial septum; LS, lateral septum; vDB, vertical diagonal band; so, stratum oriens; alv, alveus; sp, stratum pyramidale;+ , immunopositive; scale bars 250 μm in top of a 50 μm in bottom of a 100 μm in b, 25 μm in c, d, 10 μm in e, 5 μm in f–h, and insets of e, f