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. 2019 Feb 26;9:2749. doi: 10.1038/s41598-019-39067-8

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© The Author(s) 2019

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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Proteins with differential abundance in GBM serum identified by iTRAQ. (A,B) Log₂ transformed ratios for proteins with at least two unique peptides having high abundance and low abundance, respectively, in GBM sera as compared to control sera are shown. (C,D) Representative tandem mass spectrometry (MS/MS) spectra for peptide sequence GNFHAVY and MLTELEK derived from S100A8. iTRAQ label 114 and 115 were used for control pooled serum sample and 116 and 117 were used for GBM pooled serum sample. (E,F) Representative tandem mass spectrometry (MS/MS) spectra for peptide sequence LGHPDTLNQEEFK and LTWASHEK derived from S100A9. iTRAQ label 114 and 115 were used for control pooled serum sample and 116 and 117 were used for GBM pooled serum sample.