APC is significantly more sensitive than conventional organic fluorophores and has been used in applications such as Flow Cytometry, Homogeneous FRET assay, and Immunoassays. APC's absorbance maximum is at 650 nm, with a resolvable emission peak at 660 nm. It shows minimal fluoresence quenching.
APC won't penetrate into the cell and cause a false-positive reaction.
Non-toxic, with less chance of affecting characteristics of the sample, human body, and environment.