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. 2022 Apr 29;13:851391. doi: 10.3389/fgene.2022.851391

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Copyright © 2022 Ding, Zhang, Luo, Wu, Lin, Liang and Xue.

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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Characterization of the gefitinib-resistant PC-9 cell line. (A,B) Growth-inhibitory curves of the two cell lines (PC-9 and PC-9/GR) were determined after 96 h of gefitinib stimulation by the CCK-8 assay (***p < 0.001).