Volume 40 of ADVANCES IN GENETICS brings together a complete listing of subjects covered in Volumes 20-39 of this premier series. In one easy-to-use source, the interested librarian, student, and researcher can find references to specific articles on topics such as tumor suppressor genes, chromosome rearrangements, apoptosis, _bax_ genes, the human genome project, muscular dystrophy, gene therapy, transcription factors, and transgenic mouse models. This cumulative subject index will serve not only as a complete overview of the major topics published in ADVANCES IN GENETICS, but also as an indicator of the progress made in genetic research over the years.