- A response to the commentary %26quot;Indolamine 2,3-dioxnenase regulation and neuropsychiatric symptoms%26quot; by Loftis, JM on %26quot;Serotonin and interleukin-6: The role of genetic polymorphisms in IFN-induced neuropsychiatric symptoms%26quot; by Udina, M., Moreno-Espana, J., Navines, R., Ginnenez, D., Langohr, K., Gratacos, M., Capuron, L., de la Torre, R., Sola, R., Martin-Santos, R. http:\\dx.doi.org/10.1016/j.psyneuen.2013.03.007