Src selectively enhances GluN2B-NMDAR responses in naïve rats. NRG1β blocks Src-mediated enhancement of GluN2B-NMDAR responses in naive rats. NRG1β has no effect on basal GluN2B-NMDAR responses in nicotine-exposed rats. Fyn selectively enhances GluN2A-NMDAR responses in nicotine-exposed rats. NRG1β has no effect on Fyn-mediated enhancement of GluN2A-NMDAR responses.