pDONR223-AXL was obtained from Addgene, Cambridge, MA, USA (Addgene plasmid # 23945) [33 (link)]. AXL cDNA was cloned into the pLenti-C-mGFP (OriGene, Rockville, MD, USA) and SCC-25 cells were transduced with this vector or empty vector as control using lentiviral transduction. Fluorescence-activated cell sorting (FACS) of GFP+ cells (FACSAriaIII, BD Biosciences, Heidelberg, Germany) was used to select positive cells. Overexpression was subsequently estimated via Western blot.
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