Case It automatically opens the MABL web site in France, for the purpose of multiple alignment and tree building. However, the URL in the current version of Case It is obsolete, so when the page automatically opens it says “bad request”. This is easily addressed by going to the correct URL: http://www.phylogeny.fr/simple_phylogeny.cgi
You can then paste the sequences into the box on the web site (Case It still automatically copies the sequences to the computer’s clipboard).
If you have any questions about using Case It, email me at email@example.com