What is the mass number of the isotope with the symbol 
?
Definitions:
Anxiety Gene
A colloquial term potentially referring to any genetic variation that is linked to an increased risk of anxiety disorders.
Neurotransmitter
Chemical substances that transmit signals across a synapse from one neuron to another.
Serotonin
A neurotransmitter that plays a critical role in regulating mood, appetite, sleep, and cognitive functions.
Dopamine
A neurotransmitter associated with the brain's reward system, movement, and motivation, playing a crucial role in feelings of pleasure and satisfaction.
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