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Glutathione (GSH) levels in both CSC populations treated for two (a,b) or five weeks (c). HTLA-CSCs and ER-CSCs were treated three times a week with 0.1 µM C2-4, with 5 µM SSZ or with 1.25 µM Etoposide, administered once a week alone or in combination with C2-4 or SSZ. GSH concentrations were determined by HPLC analysis and expressed as percentages of the control value. * p < 0.05 vs. untreated CSCs (Ctr); ** p < 0.01 vs. untreated CSCs (Ctr).
