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. 2023 Jun 14;13:9631. doi: 10.1038/s41598-023-36203-3

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© The Author(s) 2023

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 licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence 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 licence, visit http://creativecommons.org/licenses/by/4.0/.

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Intact mass analysis of N-linked removed recombinant PD-1 treated with sialidases. (a) An average raw mass spectrum of the intact protein over eluted retention time that was used for deconvolution. (b) A representative deconvolution mass of the sample; theoretical mass with the proposed glycan component was calculated for each deconvoluted glycoform (red), compared with observed mass (blue). Graphs were generated using GraphPad Prism version 9.4.1 for Windows (https://www.graphpad.com/) using original data obtained from Biopharma Finder 3.0 and Qual Browser, Thermo Xcalibur 3.1.66.10, as shown in supplementary Figs. S4, 5.