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. 2020 May 19;8:280. doi: 10.3389/fcell.2020.00280

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Copyright © 2020 Zhang, Liu, Zhang, Li, Li, Wang, Chand, Guan, Zang and Zhang.

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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HHLA2 expression is not co-expressed with B7 or CD28 family. The B7 family (A), CD28 family (B) and other immune check points (C,D) were used to analyze the correlation with HHLA2.