Applied Biosystems ProteinSEQ Protein Quantitation System is a breakthrough immuno-PCR protein quantitation platform designed for sensitive and robust host cell protein and Protein A quantitation. Leveraging the analytical benefits of TaqMan qPCR chemistry and the selectivity of immunochemistry, the ProteinSEQ system allows quantitation as low as 0.2 ng/mL of host cell protein with four logs of dynamic range.