1
acetylcholine
Chemical class: choline derivative
2
dopamine
Chemical class: biogenic amine /catecholamine
3
norepinephrine, epinephrine
Chemical class: biogenic amine /catecholamine
4
serotonin
Chemical class: biogenic amine NOT catecholamine
5
glutamate
Chemical class: amino acids
6
GABA
Chemical class: amino acids
7
endogenous opioids
Chemical class: neuropeptides
8
Endocannabinoids (anandamide)
Chemical class: endocannabinoids