Ntrol of cell division/proliferation, and modification of cell morphology. When any of these fundamental processes go awry, the results can lead to acute or chronic human disease, a partial listing of which includes cardiovascular disease ( 1-adrenergic receptor) (Drake et al., 2006), asthma ( 2-adrenergic receptor) (Kawakami et al., 2004), and strokes and cerebral hypoperfusion (A2a-adenosine rec