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Frequently asked questions

Our Scientific Applications Support team has assembled a list of frequently asked questions to help you find answers quickly. Filter using one or more categories to focus on specific topics, or use the search bar to perform a text search.

Why is your ordering system not recognizing the universal IUB codes I am using to specify mixed (degenerate, random, wobble) bases?

Be sure to use upper case letters (e.g., R, N, S) to denote mixed (degenerate, random, wobble) bases. Lower case letters are not recognized as they are used to denote certain modifications and RNA bases.

The codes are provided here:

Custom DNA & RNA

*RUO—For research use only. Not for use in diagnostic procedures. Unless otherwise agreed to in writing, IDT does not intend for these products to be used in clinical applications and does not warrant their fitness or suitability for any clinical diagnostic use. Purchaser is solely responsible for all decisions regarding the use of these products and any associated regulatory or legal obligations.