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A, a subpopulation of 5-HT3A-EGFP+ cells in the hippocampus is immunoreactive for VGLUT3 and CB1Rs. A1, arrowheads point to VGLUT3/CB1R+ processes. B, CB1R+/GAD67+ boutons contain the 2-AG degrading enzyme MGL (arrowheads), C–C3, CCK+ interneurons express 5-HT3ARs and CB1Rs. Arrowheads indicate CB1R+ structures. Scale bars: 20 μm (A, A1, C), 5 μm (B) and 1 μm (C3).
