Three Gene Construction Kit (GCK) files have just been posted to the IUBio archives. All of the files are self-extracting archives that need to be de-binhexed first. 1) GCK-Movie.seq.hqx is a Macromind Director self running animation illustrating some of the features of the Gene Construction Kit. You will need a color Mac with at least 3 MB or RAM to run this movie. 2) GCK-Enzymes-12-93.hqx.sea consists of a number of GCK restriction enzyme list files containing all the enzymes in Rich Roberts' REBase (as of 12/92). The GCK Lists are in categories like 6-cutters and commercially avialable. Together there are 12 files in the archive. Ths file will be updated monthly. 3) GCK-Demo-v1.16.sea.hqx contains a complete demo version of the Gene Construction Kit along with many supporting files and sample illustrations. There is a tutorial folder and a tutorial document to use. I hope you enjoy these files. For more information about the Gene Construction Kit, contact: Textco, Inc. 27 Gilson Rd. West Lebanon, N.H. 03784 U.S.A. (603) 643-1471 Bob Gross