Long-term viability assay was performed by colony formation assay. In brief, cells were seeded in 6-well plates and allowed to adhere overnight then treated with DMSO control (0.1% v/v) or LY2835219. Media were changed every 3 days with fresh reagents added. Following 10-day treatment, cells were fixed and stained with crystal violet. Colonies with > 50 cells were quantified using ImageJ (NIH, Bethesda, MA).
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