... Martin, D. Viskochil, G. Bollag, P. C. McCabe, W. J. Crosier, H. Haubruck, L. Conroy, R. Clark, P. O'Connell, R. M. Cawlhon, M. A. Innis, and F. McCormick, Cell (Cambridge. Mass. ) 63, 843 (199(I). ... J. E. Childs, and C. J. Marshall, Cell (Cambridge, Mass.) 57, 1167 (1989). 5 S. Clarke, Annu. Rev. Biochem. 61, 355 (1992). J. F. Hancock, H. Patcrsom and C. J. Marshall, Cell (Cambridge, ... Health Sciences Center, Charlottesville, Vir- York II 724 ginia 22908 RHONDA L. BOCK (38) Department of Cancer ANDREW D. CATLING (25), Department of Mi- Research, Merck Research Laboratories,...