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. 2020 May 7;10:7704. doi: 10.1038/s41598-020-64737-3

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© The Author(s) 2020

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 license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license 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 license, visit http://creativecommons.org/licenses/by/4.0/.

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Representative space-resolved Raman spectra measured within pink biofilms collected from a bathroom in different homes in Takarazuka (A) and Toyonaka (B). These data were recorded with a commercial upright-type Raman microscope (HORIBA XploRA Nano) equipped with a 532-nm laser. The excitation laser power at the sample point was ~4 mW, and the exposure time was 5 s. A 100×, oil-immersion objective (NA = 0.9) was used.