Erlendur Helgason wrote: > > You should be able to use MEGA for this, > http://evolgen.biol.metro-u.ac.jp/MEGA/ Thanks. I have MEGA, too. However, it does not include the type of distance analysis (i.e. by aa composition) I require. Any other tip? Thorsten -- Thorsten Burmester thorsten at erfurt.thur.de