An index can be constituted-of-or-filled-with (serotonin transporter density).Logical formLearned from4 sentences. A serotonin can be detectable.Logical formLearned from4 sentences. Response can be to serotonin.Logical formLearned from4 sentences. A serotonin may be released.Logical formLearned from4 sentences. Blood may trigger release of serotonin.Logical formLearned from4 sentences. Platelets may secrete serotonin.Logical formLearned from4 sentences. Serotonin may prompt platelets to aggregate.Logical formLearned from4 sentences. Changes can be in a (serotonin system).Logical formLearned from4 sentences. Serotonin may undergo importance.Logical formLearned from4 sentences. A class may be knowned as (serotonin reuptake inhibitors).Logical formLearned from4 sentences. A combination of exercise may raise (serotonin levels).Logical formLearned from4 sentences. A link can be between (serotonin receptors).Logical formLearned from4 sentences. A (chemical messenger serotonin) can be after birth.Logical formLearned from4 sentences. A (receptor protein) can be for a (chemical messenger serotonin).Logical formLearned from4 sentences. (Serotonin receptors) may account for importance of nurturing.Logical formLearned from4 sentences.