Hi, For those of you who are studying bioinformatics, Brian Higgins at UC Davis has put together a series of Mathematica notebooks illustrating many of the basic concepts and algorithms including Mathematica implementations. You can read more about his notebooks and download them here: http://www.higgins.ucdavis.edu/biomath.php. The code in these notebooks would also be good for those interested in using Mathematica to prototype informatics algorithms. Unfortunately, one area were Mathematica doesn't live up to its full potential is string parsing. At this time it doesn't support regular expressions (we are actively working to add that feature). Higgins gets around this by using Mathematica's superlative pattern matching capabilities on character lists, but I don't know how much of a performance hit one takes on account of that. I'd be interested from hearing from you professionals on that score. An alternative is to use J/Link, Mathematica's Java integration API to link to bioinformatics Java libraries like bioJava (http://biojava.org). J/Link provides an amazingly easy interface to Java classes (so easy I can use it, and that is saying something ;-)). If fact, if any of you all are interested in contributing a little time to a project to create a J/Link interface to bioJava, please drop me a line. This would be for a free and open package, and not a commercial project. For those of you who would like to know more about Mathematica, everything you could ever want to know, and a lot more, can be found at http://www.wolfram.com. If you are new to Mathematica, start at http://www.wolfram.com/products/mathematica/index.html for a comprehensive overview. The complete documentation for Mathematica (and all other Wolfram products) can be found here http://documents.wolfram.com/. When you are ready to kick the tires, you can download a trial version http://www.wolfram.com/products/mathematica/trial.cgi, or why not just buy your own copy at http://store.wolfram.com :-). Andrew Andrew A. de Laix, PhD Business Development Manager Wolfram Research, Inc. phone: 510-655-5806 email: delaix at wolfram.com web: http://www.wolfram.com