Bipolar Nutrients: Intro to Inhibitory Aminos

So, there are three main biotypes to consider in bipolar disorder.
See:

Nutritional therapies: Three Major Approaches

and Some preliminary indications of nutritional outcome

We've been discussing pyroluria for some time (April 19, 20, 23, May 6, 7, 14, 21, and May 28 to June 17), but it's just one of the biotypes, probably present in less than one third of bipolars.  
The mechanisms underlying the other two major biotypes involve the status of neurotransmitter activation or suppression.
So before talking about these, I'd like to give you some background on amino acids and neurotransmitters. 

As a short introduction, see Margot Kidder's comments on the inhibitory aminos:

http://www.alternativementalhealth.com/articles/aminobipolar.htm

Important: Since we are now focused on mania, the info on tyrosine, and the inclusion in her regimen of  tyrosine, phenylalanine, and glutamine are not relevant  here.