text: Yo, listen up, I got a story to tell,
  'Bout gene expression and cells, you know it's swell.
  Translational control, it's the real deal,
  Regulates development, how cells reveal.
  
  We focused on the nanos2 gene, no joke,
  Checked out the 3'UTR, that's where we spoke.
  Knock-in mice, some with UTR intact,
  Compared their phenotypes, yo, that's a fact.
  
  The nanos2-3'UTR, it's got a role,
  In translational regulation, it takes control.
  Represses mRNA translation in oocytes,
  But in male gonads, protein production increases.
  
  To dig deeper, we made a mouse line,
  nanos2pA/pA, without the UTR, it's prime.
  In nanos2(-/pA) mice, yo, we saw the deal,
  More seminiferous tubules depleted, that's real.
  
  Spermatogenesis, it took a hit,
  Dose-dependent defect, couldn't quit.
  The nanos2 protein, it's crucial, man,
  For normal spermatogenesis, gotta understand.
  
  The nanos2-3'UTR, it's in control,
  Regulating this pathway, it takes its toll.
  Apoptosis of gonocytes, neonatal testes too,
  Defects in nanos2pA/pA and nanos2(-/pA) grew.
  
  And after birth, nanos2 expression's restricted,
  To a subset of spermatogonia, it's predicted.
  Maintenance and differentiation, neonatal testes in play,
  Nanos2's got a role, gotta give it its say.