AF 568 is a bright orange-fluorescent dye that is structurally identical to Alexa Fluor 568. With its high photostability and pH resistance, it has become one of the most widely used fluorophores in life sciences.

Its hydrophilic nature makes it an ideal choice for labeling sensitive proteins. AF 568 is perfect for a variety of imaging applications, including confocal microscopy, flow cytometry (FACS), and labeling cell cultures and tissues.

The NHS ester is an amine-reactive dye: It can label amine groups in proteins, peptides, amino-modified oligos, and other target molecules.