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A. Immunoblotting analysis of EGFR and phospho-EGFR (Tyr1068) in adherent and nonadherent cancer cells. B. MTT assays were used to measure cell proliferation in adherent and nonadherent PC9 cells and A-1 cells following erlotinib treatment. Data are presented as the mean ± SD. Samples were prepared in triplicate. **P<0.001. C. Flow cytometry analysis with PI staining was used to examine dying cells.
