M. Loeffler and C. Potten, Stem Cells and Cellular Pedigrees. -- P.W. Barlow, Stem Cells and Founder Zones in Plants. -- D. Francis, The Stem Cell Concept Applied to Shoot Meristems of Higher Plants. -- D.J. Watt and G.E. Jones, Skeletal Muscle Stem Cells-Function and Potential Role in Therapy. -- C. Dulac and P. Cameron-Curry, Cell Progenitors in the Neural Crest. -- A.M. Schor and S.L. Schor, Phenotypic Diversity and Lineage Relationships in Vascular Endothelial Cells. -- P. Rudland, R. Barraclough, D.G. Fernig, and J.A. Smith, Mammary Stem Cells in Normal Development and Cancer. -- J.W. Grisham and S.S. Thorgeirsson, Liver Stem Cells. -- D.G. de Rooij and F.M.F. van Dissel-Emilani, Regulation of Proliferation and Differentiation of Stem Cells in the Male Germ Line. -- N.A. Wright, Stem Cell Repertoire in the Intestine. -- S.J. Miller, R.M. Lavker, and T.-T. Sun, Keratinocyte Stem Cells of Cornea, Skin, and Hair Follicles. -- J. Kummermehrand K.-R. Trott, Tumor Stem Cells. -- B.I. Lord, The Haemopoietic Stem Cell. -- C.M. Heyworth, N.G. Testa, A.-M. Buckle, and A.D. Whetton, Growth Factors and the Regulation of Haemopoietic Stem Cells. -- J.A. Nolta and D.B. Kohn, Haematopoietic Stem Cells for Gene Therapy. Subject Index.