text: Yo, check it out, I'm 'bout to spit some knowledge,
  'bout S-9 liver fractions and cytotoxicity in college.
  In vitro, we examine metabolism's effect,
  But there's a problem, let me dissect.
  
  We add activating enzymes to the mix,
  But we also got deactivation pathways, don't dismiss.
  Glutathione plays a role in this game,
  But with humans, we can't manipulate the same.
  
  So we tested phorone, a glutathione-depleting agent,
  To see if it could alter the cells, make 'em adjacent.
  3T3-L1 and V79, the target cells we used,
  FRAME kenacid blue method, cytotoxicity infused.
  
  Phorone showed some toxicity, that's true,
  And it effectively depleted glutathione too.
  When combined with S-9 and the target cells in sight,
  The toxicity to 3T3-L1 cells took flight.
  
  Seems like phorone transformed, became toxic,
  A metabolite that's truly chaotic.
  Animal S-9 fractions with phenobarbitone and beta-naphthoflavone,
  Made phorone's toxicity greatly known.
  
  Cytochrome P-450 enzymes played a role,
  In phorone's metabolism, taking its toll.
  But when we added exogenous glutathione,
  The toxicity reduced, it wasn't in the danger zone.