Patent ID: 8613905

Claim:
An agent comprising: i) a peptide of three to six amino acids comprising the amino acid sequence DThr-DVal-DVal-DAla or DVal-DVal-DAla; ii) a poly-D-Arginine, a polyamine or polyguanidine linked to the N— or C—terminus of the peptide (i) by a hydrophilic residue; and iii) (a) a detectable label selected from a radiolabel, a fluorescent label, or a magnetic contrast agent; or (b) a low molecular weight chelate selected from 1,4,7,10-tetraazacyclododecane-1,4,7-tris(acetic acid-t-butyl ester)-10-acetic acid (DOTA) or diethylene triamine pentaacetic acid (DTPA).