Scott E. Martin, Tamara L. Jones, and Natasha J. bCaplen/b, Gene Silencing Section,. Center for Cancer Research, National Cancer Institute, NIH, 37 Convent Drive, Rm. 6128, Bethesda, MD 20892, Fax: 301-402-1031, martinsc@mail.nih.gov b....../b Zoran Rankovic, Department of Chemistry, Organon Laboratories Ltd, Newhouse. Industrial bEstate/b, Newhouse ML6 0HW, United Kingdom, Fax: 44-1698-736187, z.rankovic@organon.co.uk, and J. Richard Morphy, Department of Medicinal ...