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. 2022 Feb 3;12:1875. doi: 10.1038/s41598-021-04482-3

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© The Author(s) 2022

Open Access This 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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In vivo imaging from the Emx1-ArcLight transgenic mouse. (A-C) Epifluorescence imaging. (A) Resting fluorescence from the olfactory bulb. (B) Fluorescence traces from two regions of interest (ROIs indicated by arrows in panel A). Traces are low pass filtered at 4 Hz. (C) Activity maps evoked by three different odors. Activity maps are spatially filtered with one 3 × 3 iteration of a gaussian low-pass filter. The red contours indicate the area with ∆F/F values between 95–100% of the maximum response. (D, E) 2-photon imaging. (D) (top) Resting fluorescence from the glomerular layer illustrating weak expression in the glomeruli, and brighter fluorescence on the edges of the glomeruli. (bottom) A higher magnification recording from the area illustrated by the white box. (E) (top) Odor-evoked activity could be detected from the areas of bright expression around the glomeruli. (bottom). The signals are low pass filtered at 2 Hz. The black traces in the top panel are an average of two trials (gray lines). The black traces in the bottom panel are single trials. P, posterior; M, medial.