The lentiviruses were prepared and used in a similar way as previously described (44 (link)). Briefly, lentiviruses expressing CRE-RLuc or indicated shRNA were prepared from HEK 293T cells by co-transfecting lentiviral expression plasmids along with packaging vectors using the calcium-phosphate method (TakaRa). DTC-1 cells were transduced with lentiviruses expressing CRE-RLuc. After puromycin selection, the cells were used directly for reporter assays.
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