I understand that neurotransmitters are used to send signals between neurons in the brain and that some are used for rather specific functions. However, is the exact distribution/concentration/consumption and tolerances of neurotransmitters in various areas of the brain known?

Related and considered:
Which neurotransmitters can be measured in a living human brain?
Neurotransmitter based imaging techniques

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    $\begingroup$ The distribution of receptors (and their subtypes) is much more important than the concentrations of the neurotransmitters, which (despite science journalism's focus of late) are very dynamic. $\endgroup$ – Chuck Sherrington Oct 22 '14 at 20:28
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    $\begingroup$ @ChuckSherrington I think that comment could be developed into a worthwhile answer if you could give me some references. (: $\endgroup$ – Seanny123 Oct 22 '14 at 20:30

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