text: Yo, check it, listen up, I got a story to tell,
  'Bout this receptor called Encephalopsin, known as OPN3 as well.
  It's part of a family, light-sensitive and cool,
  Found in the brain and retina, breakin' all the rules.
  
  They thought light only impacted our rhythm in one way,
  Through the retinohypothalamic tract, where it'd sway,
  Sending info to the suprachiasmatic nucleus, no doubt,
  In the hypothalamus, where it's all about.
  
  But yo, hold up, they found somethin' new,
  Light penetrates the skull, breakin' through,
  So we did a study, here's what we found,
  Transcranial light treatment, spreadin' all around.
  
  Mice were in the mix, divided up real quick,
  Control group, morning-light, and evening-light, take your pick,
  Shinin' through their brains, five times a week,
  For eight minutes each time, four weeks, no weak.
  
  We analyzed the OPN3, checkin' out its expression,
  With western blotting, we made a fresh impression,
  And the monoamines, we measured those too,
  Using HPLC, gettin' all the clues.
  
  Let me break it down, here's what we discovered,
  Transcranial light treatment, it truly uncovered,
  OPN3's expression, it was affected, for sure,
  In different brain areas, it had an allure.
  
  Not just that, the monoamines played a part,
  In the brain and other tissues, it was an art,
  Plasma and adrenal gland, their concentrations changed,
  When the light hit 'em, their whole system rearranged.
  
  But here's the twist, it's somethin' you should know,
  When the light was administered, at a different time, yo,
  The response varied, in different tissues it played,
  Light messes with our transmitters, in a rhythmical way.
  
  So there you have it, new knowledge in sight,
  Light's impact on mammals, messin' with the fight,
  Rhythmicity's at stake, as we unravel the truth,
  Through transcranial light treatment, we're livin' proof.