What neurotransmitter was first believed to be the cause of schizophrenia?

Name: What neurotransmitter was first believed to be the cause of schizophrenia?
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Dopamine was the first neurotransmitter believed to be the cause of schizophrenia due to evidence of increased dopamine activity in some parts of the brain in individuals with schizophrenia. However, current research suggests that the cause of schizophrenia is likely more complex and involves multiple neurotransmitters and brain regions.

What Neurotransmitter Was First Believed to Be the Cause of Schizophrenia