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Immunfluorescence analysis of EGFR in MCF-10A cells grown in SFIH media (without EGF). Cells were treated with EGF, 1,6-BPQ, or 3,6-BPQ for up to 18 hrs. EGFR was rapidly lost from the cell surface in EGF treated cells, whereas BPQs maintained EGFR expression for up to 18 hrs.