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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.

Can internal NHS ester modifications be linked to any base?

All catalog offerings for internal NHS ester modifications are coupled to an Amino dT modifier post synthesis. Currently, the other three bases are not regularly available for internal NHS ester labeling; however, if you have such a request, please contact Technical Support at

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.