The complete coding sequence of ETS1 was amplified by PCR from human genomic DNA using the forward primer, 5′- GGAATTCC GCCACCATGAGCTACTTTGTGGATTCT-3′ and reverse primer, 5′- ACGCGTCGACTCACTCGTCGGCATCTGG CTT-3′. The ETS1 plasmid was constructed by inserting the CDS into a mammalian expression vector, pCDH-EF1-copGFP (Addgene, Inc.), which contained a CMV promoter driving the expression of GFP and ETS1. The negative control used in this study was the empty vector. A total of 2.5 µg pCDH-EF1-copGFP-ETS1 (pCDH ETS1) or empty vector (pCDH Blank) was transfected into BEAS-2B cells (105 cells per well of 6-well plate) to rescue the low-expression induced by mimic transfection. Transfection was performed using Lipofectamine® 6000 reagent (Invitrogen; Thermo Fisher Scientific, Inc.) according to the manufacturer's protocol. After 48 h, transfected cells were harvested for further detection.

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