Figure 3: Effect of midkine overexpression on cellular response to doxorubicin in co-culture conditions. (a) GFP-transfected wildtype SK-N-SH cells (GFP-WT) were co-cultured with wild type (WT), doxorubicin resistant (DoxR), or human midkine overexpressing SK-N-SH cells (HMK), incubated with (+) or without (−) doxorubicin at 10−7 M for 48 hours. Photographs were taken using fluorescence microscopy. (b) The viability percentage of fluorescent cells (GFP-WT) after each treatment was determined through Hoechst 33342 staining and cell counting. Data represent an average of three independent determinations +/− SE.