text: Yo, listen up, I got a tale to tell,
  'Bout the vertebrate head, where it all dwells.
  Two structures in the mix, that's what it's about,
  Neural crest and ectodermal placodes, no doubt.
  
  We know a lot 'bout neural crest, it's true,
  Secreted factors, transcription factors, they do,
  But when it comes to placode development, it's a mystery,
  The molecular pathways, a history.
  
  But hold up, recent findings are here,
  Shedding light on the induction, don't you fear.
  Pre-placodal ectoderm, let me break it down,
  And the transcription factors, they wear the crown.
  
  They regulate fate and that initial differentiation,
  Controlling the placode, with precision.
  So here's the lowdown, the scoop on the scene,
  Placode development, it's no longer unseen.