RALB and non-small cell lung carcinoma: (G) Internalisation of EGFR over time determined by a surface biotinylation ELISA-based assay in H1299 human non-small cell lung cancer cells transfected with a non-targeting (Control) or combined Rala and Ralb knockdown constructs (siRala +b) and incubated in the presence or absence of EGF ligand.