2D cultured cells and 3D spheroids were dissociated with trypsin/EDTA; engrafted cells were isolated as described below. Cells were resuspended in PBS supplemented with 2% FCS. GFP and BFP expression was assessed by flow cytometric analysis (BD™ LSRII analyzer). Non-infected cells served as a negative control. The data were processed with the FlowJo v10 software.
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