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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.

Are you able to synthesize DNA oligos containing dU instead of dT?

We routinely make oligos that include deoxyuridinein place of deoxythymine bases. The minimum synthesis scale for oligos containing dU is 100 nmoles. The modification code for internal deoxyuridine in a sequence is /ideoxyU/, while 5' and 3' incorporations have the modification codes of /5deoxyU/ and /3deoxyU/, respectively.

More details, including pricing, are provided on the modifications page on the products tab at

Custom DNA & RNA