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Roots

Chromosomes

Branches

Neurite Outgrowth

Fruit

Characteristics

Amino Acid Neurotransmitters

Monoamine Neurotransmitters (modulatory)

Acetylcholine

Neuropeptides

Purine Neurotransmitters

Gaseous Neurotransmitters

Endocannabinoids (retrograde signaling)

Trace Amines

Lipid-Derived Signaling Molecules (non-classical)

Neurosteroids

D-Amino Acids

Cytokines as Neurotransmitters (Neuroimmune signaling)