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SgK223 and EGFR signaling. a Effect of SgK223 overexpression on EGFR Y1068 phosphorylation and Grb2 expression. b Effect of SgK223 overexpression on additional EGFR tyrosine phosphorylation sites. Data are normalized and expressed as in the previous figs. c The EGFR inhibitor, erlotinib, does not affect Stat3 phosphorylation in SgK223-overexpressing cells
