Final answer:
Serotonin is a biogenic amine neurotransmitter that is not a catecholamine. Serotonin is made from tryptophan and is involved in various functions such as mood regulation, sleep, and appetite.
Step-by-step explanation:
The neurotransmitter that is a biogenic amine but not a catecholamine is serotonin.
Serotonin is made from tryptophan and is involved in various functions such as mood regulation, sleep, and appetite.