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Currently, only consecutive bases are allowed when ordering online. Specifically, up to 18 consecutive N or K bases can be ordered, with a minimum of 125 bp of fixed, flanking sequence on either side of the variable bases. The maximum length for the entire sequence is currently 500 bp, including the variable bases.
In some cases, we can accommodate special non-catalog requests. If you require a sequence outside of these design specifications, please contact genes@idtdna.com for evaluation.