PCM33L, 2×Ultra Sybr qPCR Mix (Low Rox) The 2×Ultra Sybr qPCR Mix (Low Rox) is a premixed system for realtime fluorescence quantitative PCR (SYBR Green I), and the concentration is 2×. It contains Golden Star Taq DNA Polymerase, PCR Buffer, dNTPs, SYBR Green I Fluorescent Dye, Mg2+ and Low ROX as reference dye.