This unilocular radiolucency around the crown of an unerupted second premolar is most likely a: 
Definitions:
Serotonin
A chemical messenger crucial for moderating emotions, digestive processes, sleep patterns, and various other physiological activities.
GABA
Gamma-aminobutyric acid, a neurotransmitter in the brain that plays a key role in inhibiting nerve transmission, thus reducing neuronal excitability.
Acetylcholine
A neurotransmitter involved in many functions including muscle movement and memory.
Curare
A toxic plant extract used traditionally as an arrow poison and medically to relax muscles during surgery.
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