text: Yo, check it out, I got the methods to determine
  Urea cycle enzymes, human and rat tissues, I won't fumble
  Chromatography and videodensitometry, the CV technique
  Keepin' it real, nothin' changed, just listen and see
  
  Carbamoyl-phosphate synthetase, ornithine carbamoyltransferase
  We measure their activity, no time to waste
  Lookin' at the citrulline formed, that's the clue
  Specific substrates, we know what to do
  
  Argininosuccinate synthetase, argininosuccinate lyase
  Arginase activities, we got 'em on the rise
  Ornithine concentration, that's the key
  Changes in it, gonna tell us how it be
  
  We only need 5 to 10 mg wet weight of tissue
  That's enough, no need to continue
  CV technique, it's convenient, no doubt
  Investigatin' enzyme content, human biopsy, we're about