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. 2021 Apr 15;11:632540. doi: 10.3389/fonc.2021.632540

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Copyright © 2021 Guo, Sun, Qian, Zhu, Ta, Wang, Zheng, Guo and Liu

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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Phenotypic profiling of feeder expanded NK cells (*p < 0.05, ***p < 0.001). (A) Frequency of CD16⁻ and CD16⁺ NK cell subsets in the expanded cells. (B) Expression of natural killer receptors (NKG, CD94/NKG2A/NKG2C/NKG2D) in the expanded cells. (C) Expression of killer inhibitory receptors (KIRs, KIR2DL1/L2/L3/S1/S3/S5/KIR3DL1) in the expanded cells. (D) Expression of natural cytotoxicity triggering receptor (NCRs, NKp30/NKp44/NKp46) in the expanded cells.