text: Yo, check it out, I got something to say,
  'Bout G protein-coupled receptors, in a rap display.
  They play stimulatory or modulatory roles,
  In physiological states, they take control.
  
  Growth and development, they got it on lock,
  Vision, taste, and olfaction, they make it rock.
  Behavior, learning, emotion, and mood,
  Inflammation, autonomic functions, they're all good.
  
  Blood pressure, heart rate, and digestion too,
  GPCRs regulate them, that's what they do.
  They're the largest protein superfamily in the mix,
  Prescription drugs target 'em, that's how they fix.
  
  But here's the thing, most are poorly known,
  Out of 350 nonolfactory GPCRs, it's shown,
  Over 100 are orphans, no ligand in sight,
  No endogenous match, nothin' to ignite.
  
  But hold up, listen close, 'cause here's the scoop,
  We got new live-cell assays, ain't no dupe.
  Recombinant GPCRs, we put 'em to the test,
  Quantifyin' receptor desensitization, we're the best.
  
  Resensitization too, we got it covered,
  With a fluorogen-activating protein, we discovered,
  It forms complexes with organic molecules, you see,
  Fluorescence enhanced, that's the key.
  
  No wash, no cleanup, it's all in the game,
  Microwell plates, high-throughput, that's our aim.
  Drug discovery applications, we're breakin' new ground,
  With these assays, GPCRs are found.
  
  So there you have it, the rap's complete,
  GPCRs and their biology, can't be beat.
  Stimulatory, modulatory, they're everywhere,
  In the realm of science, they're the players we share.