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Which specific gene was the primary focus of investigation in the Caspi et al. (2003) study regarding depression vulnerability?.
- A.Dopamine D4 receptor gene (DRD4)
- B.Brain-derived neurotrophic factor (BDNF) gene
- C.Serotonin transporter gene (5-HTT)
- D.Catechol-O-methyltransferase (COMT) gene
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