Do you have a nucleotide modification that I can use for PCR incorporation that prevents further DNA amplification but is also a reversible modification? -Pete -

The only analog that has the properties you described is our CleanAmp™ dNTPs. Although the protecting group will not be stable during the elevated temperatures of PCR, certain enzymes such as the Therminator series of enzymes can incorporate this type of analogs. However, incorporation would need to be performed at low temperatures, such as at room temp. Then, a heat activation step can be used to remove the protecting group.