- Cholinergic cells in the nucleus basalis of mice express the N-methyl-d-aspartate-receptor subunit NR2C and its replacement by the NR2B subunit enhances frontal and amygdaloid acetylcholine levels. De Souza Silva, M.A., Dolga, A., Pieri, I., Marchetti, L., Eisel, U.L., Huston, J.P., Dere, E. Genes Brain Behav. (2006)