Identify the arrow in the following equation. 
Definitions:
Schizophrenia
A mental disorder characterized by disturbances in thought, perception, and behavior, manifesting in symptoms such as hallucinations, delusions, and disorganized speech.
Phenothiazines
A class of antipsychotic drugs used to treat mental disorders such as schizophrenia, bipolar disorder, and severe anxiety by affecting neurotransmitter levels in the brain.
Neuroleptics
Drugs used to treat psychotic symptoms.
Neurotransmitters
Chemicals that transmit signals across a synapse from one neuron to another in the nervous system.
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