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. 2022 Oct 26;16:997360. doi: 10.3389/fncel.2022.997360

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Copyright © 2022 Ge, Cai and Pan.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) 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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Distinct, input-specific types of cells in CeAl and CeAm from naïve rats. (A) A schematic of experimental settings for cell types in CeAl, with the adeno-associated viral (AAV) vector, AAV-CaMKII-hChR2-mCherry, injected in the PBN and 4 weeks later, electrical stimulation in BLA, and light (optical) stimulation and whole-cell recording in CeAl. (B) Images of fluorescence staining in transfected cells in PBN (Left) and projection terminals in amygdala (Right). Scale bars = 500 μm. opt, optic tract. (C) Sample traces of light-evoked EPSCs (lEPSCs) by 473 nm light at 0.5 Hz in CeAl neurons before (control) and after application of CNQX (10 μM), n = 4. (D) Representative EPSC traces in CeAl cells that display (1) both PBN-elicited lEPSC and BLA-elicited eEPSC (dual-input), (2) lEPSC only (PBN-input only), (3) eEPSC only (BLA-input only), and (4) no EPSC (none input). eEPSCs were evoked by 600 μA. (E) Number and percentage of each cell type in the population of CeAl cells recorded. (F) A schematic of experimental settings similar to A, but with light stimulation and whole-cell recording in CeAm. (G) Traces of lEPSCs in CeAm neurons before (control) and after application of CNQX (10 μM), n = 4, with the same light stimulation as in C. (H) Current traces in a CeAm cell with lEPSC only (PBN-input only). (I) Percentage of three cell types found in CeAm. The numbers on top of each column indicate the cell number in each group of the cell types.