A lack of a (neurotransmitter serotonin) can be some areas of origins.Logical formLearned from1 sentences. Variety may pertain-to a (serotonin transporter gene).Logical formLearned from1 sentences. (Shuttle serotonin) can be throughout a brain.Logical formLearned from1 sentences. A reduction can be in (serotonin levels).Logical formLearned from1 sentences. (Serotonin levels) can be in (cell cultures).Logical formLearned from1 sentences. A gene may influence serotonin.Logical formLearned from1 sentences. Serotonin can be through an enzyme.Logical formLearned from1 sentences. A genetic defect may lower (serotonin levels).Logical formLearned from1 sentences. Drugs may raise (serotonin levels).Logical formLearned from1 sentences. A (serotonin theory) may live_on in a mind.Logical formLearned from1 sentences. A low can be on serotonin.Logical formLearned from1 sentences. A (serotonin theory) may appeal to a medical community.Logical formLearned from1 sentences. Depression may be linked to levels of a (neurotransmitter serotonin).Logical formLearned from1 sentences. (Serotonin reuptake inhibitors) can be to children.Logical formLearned from1 sentences. (Brain neurons) may release serotonin.Logical formLearned from1 sentences.