REFERENCES Yeast techniques 1. Guthrie, C., and G.R. Fink 1991 Guide to yeast genetics and molecular biology. Methods in Enzymology vol 194. Acedemic Press Inc. 2. Ausubel, F.M., R. Brent, R.E. Kingston, D.D. Moore, J.G. Seidmen, J.A. Smith, and K. Struhl. 1987-1993 Current Protocols in Molecular Biology, Greene Publishing Associates. Yeast transformation 1. Gietz, D., A. St. Jean, R.A. Woods, and R.H. Schiestl 1992 Nucleic Acids Research 20:1425