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. 2020 May 29;412(19):4619–4628. doi: 10.1007/s00216-020-02711-8

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© The Author(s) 2020

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Fig. 7 — Comparison of total protein concentrations (presented as mean ± SD) of REV samples obtained from different sources (different donors). Assays providing significantly different concentration values (based on Tukey’s test) are marked with stars for each sample. AUC means the amide I band area–based determination, while PLSR is the PLS regression–based determination