To decrease the limitations of the current work, further studies with functional brain imaging of the serotonergic system in patients with MS can better elucidate the role of serotonin in this disease.27 This method would clarify the role of SERT in depressed or anxious patients with MS, and provide information of use to determine the optimum pharmacological therapy with antidepressants in these patients. Here, SLC6A4 is linked to myeloid sarcoma.