EdU staining was performed to visualize proliferating cells using a Click-iTTM EdU Alexa Fluor® 488 Imaging kit (Invitrogen) according to the manufacturer's instructions. Cells were seeded into eight-well slides and cultured overnight. The following day, 10 µM EdU was added to the culture media and incubated for an hour. The cells were then fixed and permeabilized. Nuclei were counterstained with Hoechst 33342. Soft agar colony formation assays were performed as described in a previous study 16 (link).
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