Cell viability was assessed as relative redox metabolic activity using a resazurin-based assay. CLB-BAR and CLB-GE neuroblastoma cells (0.4 × 105) were plated on collagen-coated 48-well plates. Cells were incubated with 55 μM resazurin (Sigma-Aldrich) for 3 hours at 37°C. Metabolized resazurin was analyzed by a plate reader (TECAN, Männedorf, Switzerland) as relative fluorescence.

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