Cyanine3 amine hydrochloride, a potent green fluorescent dye and analog of Cyanine3 amine, features a primary amine group. This compound can be covalently coupled with reactive groups including NHS esters, carboxy groups (after carbodiimide activation), and epoxides. It exhibits an excitation wavelength (λ ex) of 555 nm and an emission wavelength (λ em) of 570 nm [1].