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. 2020 Jul 3;10:1072. doi: 10.3389/fonc.2020.01072

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Copyright © 2020 Zhou, Yang, Ao, Höti, Gabrielson, Chan, Zhang and Li.

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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Identification of periostin in lung BAL samples. The MS/MS spectrum corresponding to periostin peptide sequence EVN*DTLLVNELK (Charge: +2, Monoisotopic m/z: 694.37050 Da, MH+: 1,387.73373 Da) (A) and IFLKEVN*DTLLVNELK (Charge: +3, Monoisotopic m/z: 630.35892 Da, MH+: 1,889.06221 Da) (B). N* is the formerly N-linked glycosylation site and deaminated to Aspartic Acid (D) when N-glycans were released from the site by PNGase F.