The barks of Phellodendron amurense.

MQAE, a fluorescent chloride ion indicator, is more sensitive and selective than 36Cl and microelectrode-based methods for chloride measurement in cells.

α-Conotoxin M I is a potent and selective inhibitor of mAChR and α1β1γδ nAChR, but has no effect on nicotine-stimulated dopamine release. α-Conotoxins are small, disulfide-rich peptides that competitively inhibit muscle and neuronal nicotinic AChRs.