text: Yo, check it out, here's the lowdown,
  Recent proteome analyses, let me break it down,
  Posttranslational modifications, PTMs they say,
  But protein citrullination, still a mystery, okay?
  
  We did a proteomic analysis, went deep in the game,
  Found over 100 PAD4 substrates, that's the name,
  One-fifth of 'em had an RG/RGG motif in sight,
  PAD4 blocked methylation, kept things tight.
  
  FET proteins like FUS, EWS, TAF15,
  And hnRNPA1, genes causin' ALS, you know what I mean,
  PAD4 citrullination stopped aggregation, no doubt,
  Neurodegenerative diseases, we're kickin' 'em out.
  
  FUS protein levels, in arsenic-induced stress,
  Padi4 knockout MEFs, showed progress,
  And rs2240335, it's no joke,
  Low PADI4 expression, ALS risk, hope you spoke.
  
  So listen up, PAD4's got the power,
  RGG citrullination, solubility in the hour,
  ALS pathogenesis, it's all in the mix,
  PAD4's playin' a key role, that's the fix.