text: Yo, check it out, let me break it down,
  I got some science facts, gonna rap 'em 'round.
  Talkin' 'bout mRNA, genes without no introns,
  They got a special region, y'all, it's called the CAR zone.
  
  CAR, cytoplasmic accumulation region, that's the name,
  It's crucial for them mRNAs to maintain their game.
  Surprisingly, these CARs, they ain't small,
  They range from 160 to 285 nucleotides, y'all.
  
  Now listen up, I found somethin' real neat,
  A 10-nucleotide sequence, it's the CAR-E beat.
  I wanted to know if it helps with the mRNA fuss,
  So I put multiple CAR-Es in front of β-globin, just trust.
  
  Guess what? The tandem CAR-E, it did the trick,
  Rescued β-globin from nuclear cling, real slick.
  But the antisense CAR-E, nah, it didn't do a thing,
  Only the forward sequence had that cytoplasmic swing.
  
  I made some mutations, changed the dinucleotides,
  And those CAR-Es lost their power, no longer on the rise.
  I found out CAR-E gets cozy with the export crew,
  TREX machinery, Prp19, and U2AF2, too.
  
  When I knocked down those factors, mRNAs stayed in the core,
  No cytoplasmic journey, they were trapped, no more.
  So, to wrap it up, CAR-E drives the export show,
  Recruits the machinery, makes the mRNA flow.