Transferrin protein conjugated to FITC (fluorescein isothiocyanate) dye (green). Plasma membrane stained with phalloidin conjugated to TRITC (tetramethylrhodamine B isothiocyanate) dye (red). DNA stained with DAPI dye (blue).

Courtesy of Zally Torres. Griebenow Lab. UPR-Río Piedras Chemistry