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. 2022 May 9;9:881924. doi: 10.3389/fnut.2022.881924

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Copyright © 2022 Gu, Wang, Peng and Zhao.

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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FIP-fve is detected by MALDI-TOF/TOF. The molecular weight of FIP-fve was measured by matrix-assisted laser desorption ionization time-of-flight mass spectrometry in a positive ion mode, with the calibration ranges of the linear medium molecular weight calibration materials being 5,737.609 + 50, 12,362 + 50, and 16,952 + 50.