An improved sequence handling package that runs on the Apple Macintosh.

We report improvements to our sequence analysis package and adaptation to run on the Apple Macintosh range of machines. The 'standard' version of the programs, which run on a VAX, has been given a new user interface that makes the programs very much easier to work with and has facilitated the move to the Macintosh. The reorganization of the code should simplify moves to other systems that offer WIMP user interfaces. In addition to a large number of small but useful extra features, some important new analytical functions have been devised. These include sequence and contig editors; optimal alignment and comparison methods; and a new method for comparing the observed and expected frequencies of selected oligonucleotides.