Table 1. Binding of PGE₂ and PGE₂-G to prostanoid receptors.

	EP1	EP2	EP3	EP4	DP	TP	FP	IP
PGE2-G	979	>19,800	378	737	13,300	>22,300	16,700	>20,600
PGE2	10.1	0.82	0.7	0.7	(307)	(29,000)	(119)	(>100,000)

Membrane fractions from HEK 293 cells stably overexpressing EP_1-4, DP, FP, TP, and IP receptors were analyzed for ³H-PGE₂ binding in the presence or absence of cold PGE₂-G. The values in parentheses are for comparison and are taken from an identical assay performed by Abramovitz et al. (6).