text: Yo, check it, listen up, I got a story to tell,
  'Bout a neurodegenerative disorder, HD, oh well,
  Caused by CAG repeats, abnormal expansion's the deal,
  On chromosome 4p16.3, that's for real.
  
  Past studies showed, man, it's all about the size,
  Of them expanded CAG repeats, it's no surprise,
  The bigger they get, the later onset's in sight,
  But what 'bout the normal allele, is it involved in this fight?
  
  Collected data from two cohorts, let's put it to the test,
  To see if the unexpanded CAG interacts with the rest,
  NEHD and HD-MAPS, two independent crews,
  221 and 533 affected persons, they got the news.
  
  Evidence showed an interaction, it's no joke,
  Between the expanded and unexpanded CAG, folks,
  They influence the onset, that's what we found,
  P-values of 0.08 and 0.07, hold your ground.
  
  But when we combined the cohorts, things got intense,
  Statistical significance, P-value of 0.012, immense,
  The heritability of AO residual, we had to assess,
  After adjusting for repeats and their interaction, no less.
  
  Tertiles of repeat sizes, that's the way to go,
  The normal allele's effect, it starts to show,
  Among folks with large HD repeats, 47 to 83,
  Size of the normal repeat, it sets them free.
  
  So there you have it, an increase in size,
  Of the normal repeat, it's like a sweet surprise,
  It may lessen the disease, for those with big repeats,
  HD affected persons, find some relief in these feats.