text: Yo, check it out, listen to this rap flow,
  Talkin' 'bout inbred mice, genetics on the go.
  Conservation of organization in the epsilon germline,
  Mapped it out, showed it's all in line.
  
  RFLP, that's restriction fragment length polymorphisms,
  Only two enzymes showed 'em, don't need no criticisms.
  Didn't correlate with the IgE-response phenotype,
  SJL, SJA, C57BL/6, BALB/c, A/ST, A/J, they all defy.
  
  IgE class-switch region, S epsilon, that's the name,
  SJL genomic clone, compared it to BALB/c, ain't it insane?
  At least 95% homologous, those sequences in sight,
  Differences were small, just some base pair fights.
  
  Substitutions, deletions, insertions, they're the game,
  But the biggest gap was a seven-base insertion, it's not lame.
  So that's the scoop, mouse strains and genes in action,
  Rappin' 'bout science, no need for no distraction.