Here are a few ideas that strike me looking back at what we have discussed:

• Mother Nature knows the same chemistry we do: aldol condensations, sigmatropic rearranagements, nucleophilic acyl substitution.....

• Sometimes the details are a little different:
  • Phosphate instead of tosylate as leaving group

  • Charge-relay instead of strong acids or bases

  • NAD⁺/NADH instead of chromic acid and sodium borohydride...

  • Etc., etc.....

• Curly arrows don't lie: the electrons go where they have to go

  Or, more scientifically, ALL reactions, even biological ones, are driven by HOMO-LUMO interactions

• Correctly expressed stereochemistry is essential to understanding stereoselectivity in biochemical reactions

• Non-covalent interactions between molecules are the key to everything in biological chemistry

• Evolution is as evident in biochemical structure and mechanism as it is in physiological structure and mechanism

I hope this has been as much fun for you as it has been for me.