text: Yo, check it out, I got a scientific tale to tell,
  'Bout Act. levoris, strain 28, doin' quite swell.
  Studied the natural variation, gotta keep it real,
  Colony morphology and levorin's the deal.
  
  Strain 28 had three colony types, let me break it down,
  The main type, 99.7 percent, runnin' the town.
  But when it came to levorin and levoristatin,
  Production varied, it's a wild situation.
  
  Levorin ranged from 20 to 180, that's the spread,
  While levoristatin went from 0 to 300, nothin' but lead.
  Now there's a mutant in the mix, call it M-28,
  Different colony morphology, phage titer, and its own fate.
  
  Isolated after passages on agarized Chapek media,
  With starch in the mix, no selection, gettin' greedier.
  M-28 showed a preference for levoristatin's game,
  Levorin and levoristatin, ain't they not the same?
  
  Selected variants, standin' out from the crowd,
  Different ratios in the culture fluid, they're loud.
  No correlation in production, strain 28's got no ties,
  Different strains, different results, no surprise.
  
  When it comes to preparations, things take a twist,
  Strain M-28 brings a significant levoristatin fist.
  So there you have it, the study's conclusion,
  Natural variation, makin' waves, no illusion.