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. 2019 Sep 11;9:13125. doi: 10.1038/s41598-019-49485-3

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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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Binding affinity of PD-L1_1 and its variants to human PD-L1 protein and mouse CT26 cancer cells. (a) ELISA assay on human PD-L1/Fc protein carried out with 10_3 (grey curve), 10_12 (black curve) or PD-L1_1 (dashed curve). (b) Cell ELISA on CT26 colon cancer cells to test the crossreactivity of 10_3 (grey bar) and 10_12 (black bar) mAbs compared to that of the parental PD-L1_1 (white bar). Error bars depicted means ± SD. P values for the indicated mAbs relative to untreated control, are: ***P ≤ 0.001; **P < 0.01.