Birdsall N J, Burgen A S, Hulme E C, Wells J W
Br J Pharmacol. 1979 Nov;67(3):371-7. doi: 10.1111/j.1476-5381.1979.tb08690.x.
1 There are no selective effects of Na+, K+, Ca2+, Mg2+ or Cl- on the binding of antagonists or agonists to muscarinic receptors in rat brain. A decrease in affinity related to ionic strength is found for all these ions. 2 Larger effects were produced by T1+, La3+, and some transition metal ions.