Toll-like receptor 4-mediated nuclear factor-κB activation in spinal cord contributes to chronic morphine-induced analgesic tolerance and hyperalgesia in rats - Liying Bai; Caihong Zhai; Kun Han; Zhisong Li; Junliang Qian; Ying Jing; Wei Zhang; Ji-Tian Xu (Neuroscience Bulletin, 2014)