text: Yo, listen up, I got some facts to share,
  'Bout neurotransmitters and receptors in the air.
  Glutamate's the one that gets the brain hyped,
  Excitatory vibes, yo, it's the primary type.
  
  AMPA receptors, they be quick with the flow,
  Mediating synaptic transmission, here we go.
  Tetrameric assemblies, four subunits they hold,
  GluR1 to GluR4, that's how they unfold.
  
  In them pyramidal cells, that's where they reside,
  Heteromeric receptors, GluR2's on the ride.
  Either GluR1 or GluR3, they team up tight,
  AMPA receptors, bringing synaptic might.
  
  Trafficking of GluR1 and GluR2 needs some action,
  Activity's the key, that's the main attraction.
  But GluR2 and GluR3, they move on their own,
  No need for activity, they constantly roam.
  
  The theory says it's all 'bout the subunits' tail,
  The cytoplasmic C termini, yo, that's the trail.
  But hold up, that theory's based on some tricks,
  Using unnatural receptors, that's how it sticks.
  
  So we took the GluR2 knock out, no doubt,
  To see if mutated forms could turn it about.
  And guess what? GluR2 minus its C terminus,
  Or a chimera with GluR1's, it's never senseless.
  
  They both made it to the synapse, no need for action,
  GluR2's C terminus ain't the main attraction.
  So there you have it, the story's complete,
  GluR2 can be a synapse ninja, yo, ain't that neat?