Table 1. Half-maximal effective concentration (EC₅₀) for selected ligands at NK1R or CCK2R.

	NK1R		CCK2R
Ligand	EC50 (nM)	Ligand	EC50 (nM)
s-SubP-NH2	1.4	s-CCK4-NH2	4.9
l-SubP-NH2	0.4	l-CCK4-NH2	2.6
s-SubP-COOH	449.3	s-CCK4-Gly-COOH	>1000
l-SubP-COOH	6.1	l-CCK4-Gly-COOH	>1000

All values represent the mean from at least three independent experiments, each performed in triplicate.