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Schematic representation of radiolabeling UCMSC-EVs and purification of 99mTc-UCMSC-EVs with a MiniTrap Sephadex G-25 column. The UCMSC-EVs were labeled with 99mTcO2, which remained in the hydrophobic form to chelate the phosphonate group of the membrane, also known as surface labeling. The red circle indicates the collected fractions of 99mTc-UCMSC-EVs.
