About 2000 cells of different genotypes were planted on 96-well plates and cultured at 37 °C for 24 h. After that, 20 mM EdU was added and continued to be cultured for 2 h. Cells were collected, fixed with 4% formaldehyde, stained with EdU Apollo@594 in vitro imaging kit (Ribo) according to the instructions. EdU incorporation rate was determined by leica inverted fluorescence microscopy.
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