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Electropherograms of A431 cells loaded with 24C, lysed, and the lysate separated by CE-F. (A) Unstimulated cells. (B) Cells stimulated with 200 ng/mL EGF. (C) Cells stimulated with 200 ng/mL EGF in the presence of 10 μM gefitinib; “x” denotes marks peaks due to proteolytic fragments of 24C.
