
Keywords: cAMP; cyclic adenosine monophosphate; DAPI; 4â²,6-diamidino-2-phenylindole; LC; locus coeruleus; LPGi; lateral paragigantocellularis; NMDA; N-methyl-d-aspartate; PBS; phosphate-buffered saline; PKA; protein kinase; morphine dependence; locus coeruleus; o