Skews from custom sequences

Name of sequence:
Copy sequence in the textarea below (up to 5,000,000 bp):

Window size or bases(100-50000)

Show G+C %
Show GC-skew
Show AT-skew
Show KETO-skew
Show oligo-skew for in
Show subsequence: from to

Example skew for Escherichia coli K12 showing all type of skews available. Click to enlarge.

This script has been extracted from online tools at
The type of skews describer are available for all sequenced bacterial genomes here

Source code is available at