Table 1.

Inhibition of europium-labeled insulin (Eu-insulin) for binding to the IR-A.

	Insulin	IGF-II	qIGF-I	S597
IC50 (nM)	1.57 ± 0.33	15.21 ± 0.18	4.88 ± 0.8	0.75 ± 0.16
Rel. IC50 (%)	100	10.3	32.2	209

The concentration at which 50% of Eu-insulin binding was inhibited by each peptide (IC₅₀ nM) is given. The IC₅₀ relative to that of insulin is also shown. Values are the means ± SEM of three independent experiments.