Antibodies against the following proteins were used in this study: Bip (3177 s, Cell Signaling Technology [CST]), eIF2α (5324P, CST), Phospho-eIF2α (3398P, CST), SAPK/JNK (9252S, CST), Phospho-SAPK/JNK (9255S, CST), Caspase-12(2202S, CST), Cleaved Caspase-3 (9661S, CST), Cleaved PARP (9541S, CST), Phospho-EGFR and EGFR (11862S, CST), GAPDH (60,004–1-Ig, Proteintech). PE anti-human EGFR Antibody (352,904, Biolegend). The kinase inhibitor library was purchased from Shanghai Topscience Co., Ltd (Shanghai, China). Afatinib (HY-10261) were purchased from MCE.
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