One example of an amino acid derivative that acts as both a hormone and a neurotransmitter is

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Epinephrine (also known as adrenaline) is derived from the amino acid tyrosine and acts as both a hormone and a neurotransmitter. It is released by the adrenal gland and functions as a hormone to increase heart rate, constrict blood vessels, and elevate blood sugar levels in response to stress. It also functions as a neurotransmitter in the sympathetic nervous system to mediate the fight or flight response.

One Example of an Amino Acid Derivative That Acts as Both