Fig. 2

EGF uptake in lung cancer cell lines. a Confocal images of cellular uptake of AF555-EGF by EGFR-GFP-A549 cells. b Quantification of GFP expression versus AF555-EGF uptake by flow cytometry. As shown from left to right, A549 cells alone (left), EGFR-GFP-A549 cells alone (middle), and EGFR-GFP-A549 cells treated with AF555-EGF (right), respectively