CXCR4 and neoplasm: Moreover, T22‐GFP‐H6‐FdU selectively internalized into CXCR4+ tumor cells as determined by their co‐localization (merged yellow color) in the cell membrane, using dual anti‐GFP and anti‐CXCR4 immunofluorescence, as well as the detection of released nanoconjugate into the CXCR4+ cell cytosol (green dots; Fig 2C).