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Cells were plated in 6-well plates at 200 cells per well. After 1 day, they were incubated in the presence or absence of the indicated concentration of TKIs gefitinib and afatinib. Fresh media containing each TKI was added every 3 days. After 10 days, cells were fixed in methanol and stained with 0.5% crystal violet. The number of foci >1 mm was automatically determined using Image J software.

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