@MID: Interesting, will like to see your synopsis.
@Bushy: No, thank you. Glad to finally have info flowing in the other direction. I wouldn’t mind your input on my CoQ10 vs. ubiquinol question in this thread 
juverulez’s post triggered a flashback to my nutritional biochemistry class over a decade ago. Right away I had my prof in my head talking about the competition between large neutral amino acids for transporters. I busted open my text Advanced Nutrition and Human Metabolism, 3rd Edition - 5th is available now:
http://www.amazon.com/Advanced-Nutrition-Human-Metabolism-ebook/dp/B002L6GJE2
here is one of the more interesting studies related to this:
The Kinetics of Amino Acid Absorption and Alteration of Plasma Composition of Free Amino Acids After Intestinal Perfusion of Amino Acid Mixtures