CpG ratio and GC content Plotter

A utility that takes your DNA sequence and plots the variation in CpG observed/expected ratio and GC content over it. You specify the window size and increment between successive windows. You can also restrict to a segment of your sequence if you wish. The expected number of CpG dinucleotides in the window is computed from the proportion of the bases in the window that are C (F_c) or G (F_g), by (F_c * F_g )* N, N being the window size.
Output is either a JPEG or PostScript file, or just the a list of the final x-y coords that you can use in your own graphics program.

NB: if the expected number in a window equals zero, then - to avoid an infinitely high ratio - the program uses the expected value in the adjacent window instead.

Formats: Most standard sequence formats are ok, eg FASTA, EMBL, GCG, plain text.
Name of your sequence file:

...or paste the sequence here:

Contact Martin Simmen for suggestions etc, but I make no promises...
Biomedical Sciences, College of Medicine and Veterinary Medicine, University of Edinburgh, 2008.
Link to my web site