Figure 2  .

(A) Representative surface ECGs recorded 48 hours after injection of either control constructs or constructs encoding β₂ adrenergic receptor. (B) The average percentage change in heart rate (HR) after injection of control construct or β₂ adrenergic receptor (β₂ AR) encoding plasmids (*p < 0.01 versus control). Dual fluorescence micrographs of sections of right atrial tissue co-injected with plasmids encoding green fluorescent protein and control constructs (C) and with the human β₂ adrenergic receptor (D). Green fluorescent protein was visualised directly (green), and the human β₂ adrenergic receptor was detected by immunostaining (red). Bar 32 µm.