Updated 7 June 1996
William R. Engels
Genetics Department, University
of Wisconsin
445 Henry Mall, Madison, WI 53706 USA
This review is modified and updated from a chapter in Transposable Elements, (1996) pp. 103-123 edited by H. Saedler and A. Gierl. Springer-Verlag, Berlin.
Here are some other relevant web sites: