Product Description: Sulfo Cy5.5-N3 is a Sulfo Cy5.5-azide, which is a fluorescent dye. Sulfo Cy5.5-N3 can be used in cell imagine by Click reaction. It contains an azide group and can undergo copper-catalyzed azide-alkyne cycloaddition (CuAAc) with molecules containing alkyne groups. It can also undergo ring strain-promoted alkyne-azide cycloaddition (SPAAC) with molecules containing DBCO or BCN groups.