Side population (SP) and non-SP cells were analysed and sorted from Huh7 cells as described before [14 (link)] by using Hoechst33342 staining and MoFlo sorter (DAKOCytomation). Expression of the enzyme aldehyde dehydrogenase (ALDH) was analysed by using the ALDEFLUOR Kit from Stemcell Technologies (Grenoble, France) according to manufacturer's protocol after 24 hrs exposure of Huh7 cells to MTBITC. Cell sorting was performed with a BD FACS Aria III Cell Sorter (San Jose, CA, USA).
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