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VIC is a proprietary modification owned by Applied Biosystems (Life Technologies). SUN™ is a fluorophore offered by IDT that is a molecular equivalent to VIC and available for qPCR probes and custom DNA and RNA oligos.
We suggest checking that your fluorescent detection instrument is calibrated for the dye you choose or can identify the dye once calibrated. If choosing dye combinations for multiplex qPCR, IDT offers the PrimeTime™ Multiplex Dye Selection Tool to help you find the best combination of dyes for your specific qPCR instrument.