text: Yo, check it out, we been droppin' knowledge,
  Showed diurnal shifts, hormones in college,
  Cortisol and 6 beta-hydroxycortisol,
  At 36-38 weeks, baby, we had control.
  
  No estrogen variation, that's a fact,
  But we ain't stoppin', gotta keep it intact,
  Others found a link, plasma levels in sync,
  Estriol and cortisol, at 30-35 weeks on the brink.
  
  So we took it further, had to investigate,
  Urinary concentrations, what's their fate?
  Cortisol and 6 beta-hydroxycortisol, they be fluctuatin',
  Significant variation, man, it's fascinatin'.
  
  Estriol levels, they were lower, but steady,
  Still followed the same pattern, ain't that ready?
  Gestational age, playin' tricks on the hormones,
  But we stay on track, makin' science known.