Ryu K, Cho G, Piao HZ, Kim W.  Role of TGF-β in Survival of Phagocytizing Microglia: Autocrine Suppression of TNF-α Production and Oxidative Stress.  Exp Neurobiol 2012;21:151-157.  https://doi.org/10.5607/en.2012.21.4.151