Frequently Asked Questions

In this section, you will find some of the more frequently asked questions regarding sequencing reactions and data return. We hope this will be useful for day-to-day questions.

If you do not find the answer here, please browse our information pages or call 203-737-2566 or e-mail dnasequencing@yale.edu.

Why does my sequence file contain NNNN?

There is an insufficient level of termination products for the computer software to call bases. Click here for a detailed explanation of causes of "No analyzed data" results.