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Comparison of the changes in the cell viability caused by NBIF alone (25 μM and 100 μM), drug alone (irinotecan 10 μM, etoposide 50 μM, doxorubicin 1 μM, or temozolomide (TMZ) 100 μM), and drug/NBIF mixture. Data are presented as percent of the controls, normalized to 100%. Values not sharing a common superscript differ significantly at p < 0.05.
