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| Neurotransmitter Deficiency Hypotheses of |
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| Depression |
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| • | Serotonin |
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| • | Norepinephrine |
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| • | Dopamine |
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| • | Gamma-aminobutyric
acid (GABA) |
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| • | Brain-derived
neurotrophic factor (BDNF) |
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| • | Somatostatin |
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