A role may pertain-to serotonin.Logical formLearned from4 sentences. Serotonin may undergo an accumulation.Logical formLearned from4 sentences. Serotonin may be used.Logical formLearned from4 sentences. A precursor can be to serotonin.Logical formLearned from4 sentences. A decrease can be in serotonin.Logical formLearned from4 sentences. A metabolite can be constituted-of-or-filled-with serotonin.Logical formLearned from4 sentences. Serotonin may undergo a distribution.Logical formLearned from4 sentences. (Serotonin levels) can be abnormal.Logical formLearned from4 sentences. (Serotonin levels) can be lowered.Logical formLearned from4 sentences. A deficiency can be in serotonin.Logical formLearned from4 sentences. Damage can be to a (serotonin system).Logical formLearned from4 sentences. (Serotonin concentrations) can be cortical.Logical formLearned from4 sentences. A (brain chemical serotonin) may undergo a production.Logical formLearned from4 sentences. (Brain cells) may release serotonin.Logical formLearned from4 sentences. Cells may produce serotonin.Logical formLearned from4 sentences.