| abstract |
The invention provides, inter alia, metal radionuclide-labelled reagent comprising a metal radionuclide coordinated with a metal chelate forming peptide having an amino acid sequence of three amino acid residues represented by: X1-X2-Cys, wherein X1 represents an Asp residue, a Tyr residue or a Lys residue; X2 represents an amino acid residue other than a Cys residue and a Pro residue, provided that X2 does not represent a Gly residue when X1 represents an Asp residue; wherein functional groups at the N-terminus, C-terminus and side chain may be optionally substituted with protecting groups; and wherein each of the amino acid residues may be either D-form or L-form. |