In a message dated 98-04-24 06:50:26 EDT, you write:

<< Humans, and carnivores, have given up
 the ability to synthesize certain amino acids. Thus they gain a
 bio-energetic advantage, at the cost of having to procure these amino acids
 in their diets. This is of course one reason why it is hard for human vegans
 to do well over a full cycle of growth and reproduction. >>

Interesting.  Do other primates have the ability to synthesize certain amino
acids which we don't have the ability to synthesize.  If so, I would love to
know that!

Aaron