The highly efficacious actions ofN-desmethylclozapine at muscarinic receptors are unique and not a common property of either typical or atypical antipsychotic drugs: is M1 agonism a pre-requisite for mimicking clozapine’s actions? - Davies, Marilyn A.; Compton-Toth, Beth Ann; Hufeisen, Sandra J.; Meltzer, Herbert Y.; Roth, Bryan L. (Psychopharmacology, 2005)