Region- or state-related differences in expression and activation of extracellular signal-regulated kinases (ERKs) in naïve and pain-experiencing rats oleh Cui Xiu-Yu, Gao Cui-Ying, Li Hua, Hou Jun-Feng, Yu Hou-You, Lu Zhuo-Min, Ren Li-Ying, Long Ya-Li, Liu Ming-Gang, Guo She-Wei, An Yang-Yuan, Li Junfa, Zhao Lan-Feng, Chen Jun