Western blot analysis of extracts from 293T cells, mock transfected (-) or transfected with a construct expressing full-length human β1-Adrenergic Receptor (β1AR; +) or full-length human β2-Adrenergic Receptor (β2AR; +), using β1-Adrenergic Receptor Antibody (upper) or β2-Adrenergic Receptor (D6H2) Rabbit mAb (lower)