[The bi-directional modulation of endogenous pain modulating system].
Liu
Ying
Y
Xie
Yi-Kuan
YK
D000818:Animals; D001933:Brain Stem / Q000033:anatomy & histology / Q000502:physiology*; D009434:Neural Pathways / Q000502:physiology*; D010146:Pain / Q000503:physiopathology*; D051381:Rats