Properties may pertain-to serotonin.Logical formLearned from2 sentences. A link can be between serotonin.Logical formLearned from2 sentences. Studies may implicate serotonin.Logical formLearned from2 sentences. Levels of serotonin may be linked to depression.Logical formLearned from2 sentences. An increase can be in an activity of serotonin.Logical formLearned from2 sentences. Intravenous injection can be constituted-of-or-filled-with serotonin.Logical formLearned from2 sentences. A lack may pertain-to a (chemical serotonin).Logical formLearned from2 sentences. Activity may pertain-to a (brain chemical serotonin).Logical formLearned from2 sentences. Serotonin may float.Logical formLearned from2 sentences. Drugs may act on serotonin.Logical formLearned from2 sentences. (Serotonin levels) may pertain-to a brain.Logical formLearned from2 sentences. Levels can be constituted-of-or-filled-with (blood serotonin).Logical formLearned from2 sentences. A reuptake may pertain-to a serotonin.Logical formLearned from2 sentences. Changes can be in levels of serotonin.Logical formLearned from2 sentences. Deficiencies can be constituted-of-or-filled-with serotonin.Logical formLearned from2 sentences.