Figure 1

Ab-Bethyl Specifically Recognizes Human β ₂ AR in HEK 293 Cells. HEK 293 cells stably expressing human β₂AR (A, B) and HEK 293 cells transiently expressing rat β₂AR (C, D) were either untreated (A, C) or treated (B, D) with isoproterenol for 4.5 h in parallel, fixed and processed for microscopy (Axioskop 2 plus epifluorescent microscope).