For Macintosh, there is a program called "MacPlasMap". I think it can be obtainded from "ftp://fly.bio.indiana.edu". I am using it and I think it is worth to get. I don't know of other platforms such as PC or UNIX. Sorry. Good luck! Shin-ichiro Hiraga Graduate student Osaka University shiraga4 at bio.sci.osaka-u.ac.jp