Evidence of involvement of the nNOS and the κ-opioid receptor in the same intracellular network of the rat periaqueductal gray that controls morphine tolerance and dependence

1. Herráez-Baranda, L.A.
2. Carretero, J.
3. González-Sarmiento, R.
4. Laorden, M.L.
5. Milanés, M.V.
6. Rodríguez, R.E.