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We recommend using a buffer made of 10 mM Tris, 0.1 mM EDTA, and 100 mM NaCl, pH 8.0 (such as the IDT NGS Adapter Buffer, Cat. No. 10006743) to dilute the xGen™ Stubby Adapter, xGen™ PCR-Free Adapters for Ultima, and xGen™ HybCap Adapters for Ultima.
Keeping the adapters duplexed requires a buffer with a high salt concentration.