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HCC827 and PC‐9 cells co‐cultured with their respective osimertinib‐resistant cells. (a) HCC827 cells, HCC827 cells cocultured with HCC827‐OR cells (HCC827 + OR), PC‐9 cells, and PC‐9 cells co‐cultured with PC‐9‐OR cells (PC‐9 + OR) observed under a light microscope. (b) Protein expression of factors related to EMT, as shown by western blotting analysis. EMT, epithelial–mesenchymal transition; HCC827‐OR, osimertinib‐resistant HCC827; PC‐9‐OR, osimertinib‐resistant‐PC‐9
