DLK-S expression plasmid was kindly provided by prof. Anne Ferguson-Smith [11] (link), cloned into RCAS vector by classic restriction enzyme technique and transfected into DF-1 cells. For luciferase reporter assay, cells were co-transfected with hypoxia-responsive element (HRE)-luc (Addgene) [26] (link) or 8xCSL-luc (gift from Håkan Axelson) and pCMV-renilla (Promega) and analyzed using the Dual-Luciferase Reporter Assay System (Promega) on a Synergy 2 platereader (BioTek). Xtreme gene 9 (Roche) reagent was used according to manufacturer's recommendations for transient transfections.
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