Expression of EG-R mutants.

Expression of receptor constructs in GP+E-86 packaging clones detected by flow cytometry. Cells were incubated with mouse antihuman EGF-R antibody 528 or IgG2b (control), followed by fluorescein isothiocyanate–conjugated anti–mouse immunoglobulin. Receptor expression (unfilled histograms) is shown against the control (filled histograms).