Structures of rhodopsin and the β2-adrenergic receptor. Three-dimensional structure of rhodopsin (A) and the β2-adrenergic receptor (β2-AR). (B). Notice the resemblance in the overall architecture of both receptors and the similar locations of the rhodopsin ligand 11-cis-retinal and the β2-AR blocker carazolol.
[Drawn from 1F88.pdb and 2RH1.pdb.]