Annexin derivatives with endogenous chelation sites

摘要

Modified annexins having an N-terminal chelation site comprising an amino acid extension are disclosed. The amino acid extension includes an amino acid sequence X1-Gly-X2, where X1 and X2 are selected from Gly and Cys, where at least one of X1 or X2 is Cys. Radionuclides are readily chelated by the modified annexins to provide radiolabeled annexins useful in imaging vascular thrombi and apoptosis in vivo.