How to remove unwanted characters from a DNA sequence

Reimo Tetzner reimo.tetzner at
Wed Jul 7 07:01:49 EST 2004

Andrew Leung wrote:
> Dear all,
> I was surprised that there were plenty of links about bioinformatics tools
> on the Internet, but none can help remove unwanted (or non-ATGC) characters
> from a DNA sequence - what a simple, yet frequently encountered task.
> I then designed a very simple online tool for such purpose. You may find it
> at If you have a chance to use it, please drop me
> suggestions and comments.
> Best regards,
> Andrew Leung


use the first point: _Filter DNA_

Best regards

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