Too little or too much of these important neurotransmitters may be released and cause or contribute to depression.

Such alkaloid-related substances as serotonin, dopamine and histamine are important neurotransmitters in animals.

These are all very important neurotransmitters in the brain.

The oxons then inhibit an enzyme that breaks down acetylcholine, an important neurotransmitter.

This blockage leads to the accumulation of acetylcholine, an important neurotransmitter, resulting in the insect's paralysis, and eventually death.

Depression is associated with decreased activity of important neurotransmitters like serotonin and norepinephrine.

There's also a shortage of some important neurotransmitters or chemical messengers within the brain.

Acetylcholine is the second most important excitatory neurotransmitter in the body following glutamate.

It is structurally related to acetylcholine, an important neurotransmitter at both the neuromuscular junction and autonomic ganglia.

Serotonin, which is an important neurotransmitter in mammals, can also be attributed to simple indole alkaloids.