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. 2021 Apr 13;9:640617. doi: 10.3389/fbioe.2021.640617

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Copyright © 2021 Carlomagno, Giannasi, Niada, Bedoni, Gualerzi and Brini.

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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(A–D) Average Raman spectra obtained with 532 nm laser line on air-dried drops of EV or CM samples lied on calcium fluoride slides. Both ASC-derived and DF-derived samples are shown. Gray shaded areas represent ± 1 standard deviation.