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SnapGene and SnapGene Viewer can read .seq files created by DNAssist. Shown below is an example of a DNAssist file viewed with the original program and with SnapGene.

DNAssist file viewed in DNAssist:

The same file viewed in SnapGene after using Detect Common Features:

Try it yourself. Download the free SnapGene Viewer:

If you have trouble opening a DNAssist file with SnapGene or SnapGene Viewer, please send us a message and attach the file.