epidermal growth factor. sufficient to down regulate the receptor for is gene encoding an integral membrane protein Retrovirus-mediated transfer of an adenovirus

1988. Safe andefficient genera-tion ofrecombinant retroviruses with amphotropic andecotro-pic host ranges. Proc. Natl. Acad. Sci. USA85:6460-6464.9. Felgner, P. L., T. R. Gadek,M.Hoim,R.Roman,H.W.Chan,M. Wenz, J. P. Northrop, G. M. Ringold, and M. Danielsen.1987. Lipofection: a highly efficient, lipid mediated DNA-transfection procedure. Proc. Natl. Acad. Sci. USA84:7413-7417.10. Holiday, R. 1989. Chromosomeerror propagation andcancer.TrendsGenet. 5:42-45.11. Hunter, W. M., and F. C. Greenwood. 1962. Preparation ofiodine-131 labelled human growth hormone of high