Cy3B amine chloride is a derivative of the Cyanine 3 (Cy3) dye, featuring an amine group. Cy3 is a fluorescent dye with an emission spectrum typically spanning from green to orange wavelengths. The amine functionality of Sulfo-Cy3 amine can react with carboxyl groups, forming covalent bonds. Sulfo-Cy3 amine can attach to biomolecules such as proteins and antibodies, enabling the tracking of their location and dynamic changes within biological samples.