The cell SELEX method (Cell-SELEX Aptamer for Highly Specific Radionuclide Molecular Imaging of Glioblastoma In Vivo) was used to search for DNA oligonucleotides that could bind EGFR and EGFRvIII on the cell surface of the U87MG cell line [41]. Here, EGFR is linked to glioblastoma.