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For exceptionally long oligos, such as our Ultramer™ Oligonucleotides and xGen™ Hyb Probes, IDT uses a proprietary IDT Ultramer synthesis process, which has an increased coupling efficiency.
This coupling rate helps enable us to synthesize long oligos (xGen Hyb Probes are 60–120 bases long) with a high percentage of full-length product.
Read more here.