text: Yo, check it out, let me break it down for y'all,
  Dog CYP2A13 and CYP2A25, they stand tall,
  Coexpressed with dog NADPH-cytochrome P450 reductase, that's the crew,
  In baculovirus-infected Sf9 insect cells, they do what they do.
  
  CYP2A13, it's no joke,
  Catalyzing 7-ethoxycoumarin deethylation, smoke,
  Coumarin hydroxylation, it's the same game,
  K(m) values of 4.8 and 2.1 microM, they aim.
  
  Dog liver microsomes, they compare,
  Similar K(m) values, let me make it clear,
  7.5 and 0.75 microM, that's the deal,
  CYP2A13's got the skill, it's for real.
  
  CYP2A25, it's a different story,
  Lower affinity towards 7EC, no glory,
  With an apparent K(m) value of 150 microM,
  CYP2A13 takes the lead, no room for them.
  
  Now let's talk about phenacetin, it's in the mix,
  CYP2A13 handles it like a boss, it's a fix,
  K(m) value of 3.9 microM, it's no bluff,
  Phenacetin ain't a selective probe for CYP1A2, tough.
  
  Bupropion, amodiaquine, diclofenac, they don't fly,
  S-mephenytoin, bufuralol, they won't even try,
  Dextromethorphan, midazolam, testosterone, no action,
  CYP2A13 and CYP2A25, they ain't about that satisfaction.
  
  These results, they tell us more,
  About the selectivity we're lookin' for,
  Common probe substrates, they ain't the same,
  CYP2A13 and CYP2A25, they play a different game.