Table 1.

K_I Values of Selected Compounds at the Cloned Human Opioid Receptors

Drug	MOR (nM±SD)	DOR (nM±SD)	KOR (nM±SD)
KC-2-009	26 ± 2	454 ± 25	123 ± 4
LTC-274	0.08± 0.05	2.0±0.1	0.10±0.40

Radioligand binding assays using [¹²⁵I]IOXY were conducted using published methods (Hiebel et al., 2007). Each value is the mean±SD (n=3).