Which functional group is NOT present in this tripeptide? 
Definitions:
Treating
The act of providing medical care or attention to someone or something.
Boy Or Girl
Typically refers to the biological sex of a person, determined by their physical characteristics at birth.
Psychoanalytic Theory
A theory of personality development and psychological functioning that emphasizes unconscious processes and childhood experiences.
Sexual Attraction
The feeling of being drawn toward another individual in a sexual way.
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