An enzyme can be responsible for synthesis of a majority of a serotonin.Logical formLearned from2 sentences. A majority may pertain-to a serotonin.Logical formLearned from2 sentences. (Serotonin receptor levels) may undergo a modulation.Logical formLearned from2 sentences. An antagonist may bind a (serotonin receptor).Logical formLearned from2 sentences. A (serotonin receptor subtype) may be implicated in variety of behaviors.Logical formLearned from2 sentences. (Brain cells) may use a (chemical serotonin).Logical formLearned from2 sentences. (Serotonin neurons) can be in some parts of a brain.Logical formLearned from2 sentences. Use may lower (serotonin levels).Logical formLearned from2 sentences. A study may show importance of a (serotonin system).Logical formLearned from2 sentences. A (serotonin system) may undergo importance.Logical formLearned from2 sentences. A reduction can be in (serotonin metabolism).Logical formLearned from2 sentences. (Serotonin deficits) may reflect a drop.Logical formLearned from2 sentences. (Serotonin deficits) may be measured in (postmortem brain).Logical formLearned from2 sentences. (Serotonin levels) can be in (prefrontal cortex).Logical formLearned from2 sentences. Deficits can be in serotonin.Logical formLearned from2 sentences.