Fig. 2From: 99mTc-HYNIC-(tricine/EDDA)-FROP peptide for MCF-7 breast tumor targeting and imagingRadio high-performance liquid chromatography (HPLC) analysis of 99mTc- HYNIC-(tricine/EDDA)-FROP peptide at 1 h after labeling (a) and incubated in human serum at 1 h after labeling (b). The retention time of peptide was from 20 to 22 min and for mixture of 99mTCO4− and 99mTc-co-ligand was 3–5 minBack to article page