Table 2.

Half-Lives of IYD Proteolysis by Trypsin in the Presence and Absence of Iodinated Ligands^a

ligand	t1/2 (min)b	fold change in t1/2
none	10 ± 1
I-Tyr	22 ± 2	2.2
I-tyrosinamide	27 ± 2	2.7
I-tyramine	27 ± 8	2.7
d-I-Tyr	6.2 ± 1.2	0.62

^aValues and error were obtained from fitting two independent measurements to a first-order decay in Origin 6.0.

^bSee Figures S5 and S6.