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. 2021 Jun 2;13(3):359–385. doi: 10.1007/s12551-021-00807-8

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© The Author(s) 2021

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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Fig. 7 — Curve-fitting analysis of the 900–1200 cm−1 spectral interval (a—control group, b—TM patients) and amide I/II with second derivative spectra (c—control group, d—TM patients) profiles together with (e) averaged ATR-FTIR spectra of saliva samples (black line—control group, red line—TM patients). Spectra were averaged from five healthy volunteers and five salivary gland tumour patients spectra, respectively. Reprinted from (Paluszkiewicz et al. 2020)