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3'-Amplification Reagents for IVT Labeling

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How do the labels in the GeneChip IVT Labeling Kit work?

The IVT Labeling Kit contains a proprietary biotinylated nucleotide analog (patent pending). This analog is incorporated in the T7 RNA Polymerase-mediated IVT amplification and labeling reaction as a pseudouridine reagent to generate cRNA targets.