HTLV-1 transformed human T-cell line (MT4, HPB-ATL-2) and HTLV-1 negative human T-cell lines (Jurkat, CCRF-CEM) were cultured in RPMI 1640 medium supplemented with 10% fetal bovine serum (FBS)(Biowest) and antibiotics. MT-4 and HPB-ATL-2 cells were gifts from Dr. Isao Miyoshi (Kochi University) and Dr. Shigeru Morikawa (Shimane University) respectively. Jurkat cells were obtained from Dr. Shimon Sakaguchi (Osaka University). JET WT35 is a subline of Jurkat cell expressing tdTomato under the control of 5 times tandem repeat of Tax responsive element (TRE)[45]. They were cultured with RPMI 1640 medium supplemented with 10%FBS, antibiotics and G418 (250 μg/mL) for selection.
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