[Analgesia induced by morphine administered to the nucleus accumbens was blocked by naloxone or [Met5] enkephalin antiserum injected into the periaqueductal gray of the rabbit].

@article{Yu1987AnalgesiaIB,
  title={[Analgesia induced by morphine administered to the nucleus accumbens was blocked by naloxone or [Met5] enkephalin antiserum injected into the periaqueductal gray of the rabbit].},
  author={Long Chuan Yu and Yunxi Sherlia Shi and Jeong Seok Han},
  journal={Sheng li xue bao : [Acta physiologica Sinica]},
  year={1987},
  volume={39 4},
  pages={326-33}
}