Birdsall, N. J. M., S. Bradley, D. A. Brown, N. J. Buckley, R. J. Challiss, A. Christopoulos, R. M. Eglen, F. Ehlert, C. C. Felder, R. Hammer, H. J. Kilbinger, G. Lambrecht, C. Langmead, F. Mitchelson, E. Mutschler, N. M. Nathanson, R. D. Schwarz, A. B. Tobin, C. Valant, and J. Wess. “Acetylcholine Receptors (muscarinic) (version 2019.4) in the IUPHAR/BPS Guide to Pharmacology Database”. IUPHAR/BPS Guide to Pharmacology CITE, Vol. 2019, no. 4, Sept. 2019, doi:10.2218/gtopdb/F2/2019.4.