1. It is free. 2. It has a user friendly and visually powerful multiple sequence alignment editor. 3. Analysis can readily be performed on any sequence(s) or region(s) of sequences simply by selecting the sequence(s) or region(s) of interest and choosing the desired function from the pop-up menus. 4. Although it comes with a variety of powerful sequence analysis tools, any additional programs of the users interest or updates for programs in use can be incorporated quickly and easily into the menu system.