Aasen, T. et al. 2008 Efficient and rapid generation of induced pluripotent stem cells from human keratinocytes. Nat. Biotechnol. 26, 1276–1284. (doi:10.1038/nbt.1503)
Anderson, D. J., Gage, F. H. & Weissman, I. L. 2001 Can stem cells cross lineage boundaries? Nat. Med. 7, 393–395. (doi:10.1038/86439)
Andrews, P., Matin, M., Bahrami, A., Damjanov, I., Gokhale, P. & Draper, J. 2005 Embryonic stem (ES) cells and embryonal carcinoma (EC) cells: opposite sides of the same coin. Biochem. Soc. Trans. 33, 1526–1530. (doi:10.1042/BST20051526)
Aoi, T., Yae, K., Nakagawa, M., Ichisaka, T., Okita, K., Takahashi, K., Chiba, T. & Yamanaka, S. 2008 Generation of pluripotent stem cells from adult mouse liver and stomach cells. Science 321, 699–702. (doi:10.1126/science.1154884)
Arias, A. M. 2008 Drosophila melanogaster and the development of biology in the 20th century. Methods Mol. Biol. 420, 1–25. (doi:10.1007/978-1-59745-583-1_1)
Austin, E. B., Guttridge, M., Pamphilon, D. & Watt, S. M. 2008 The role of blood services and regulatory bodies in stem cell transplantation. Vox Sang. 94, 6–17.
Barabe´, F., Kennedy, J. A., Hope, K. J. & Dick, J. E. 2007 Modeling the initiation and progression of human acute leukemia in mice. Science 316, 600–604. (doi:10.1126/science.1139851)
Brockes, J. P. & Kumar, A. 2005 Appendage regeneration in adult vertebrates and implications for regenerative medicine. Science 310, 1919–1922. (doi:10.1126/science.1115200)
Brons, I. G. et al. 2007 Derivation of pluripotent epiblast stem cells from mammalian embryos. Nature 448, 191–195. (doi:10.1038/nature05950)
Chambers, I. et al. 2007 Nanog safeguards pluripotency and mediates germline development. Nature 450, 1230–1234. (doi:10.1038/nature06403)
Chang, H. H., Hemberg, M., Barahona, M., Ingber, D. E. & Huang, S. 2008 Transcriptome-wide noise controls lineage choice in mammalian progenitor cells. Nature 453, 544–457. (doi:10.1038/nature06965)
Chen, C. S. 2008 Mechanotransduction—a field pulling together? J. Cell Sci. 121, 3285–3292. (doi:10.1242/jcs. 023507)
Clarke, M. F., Dick, J. E., Dirks, P. B., Eaves, C. J., Jamieson, C. H., Jones, D. L., Visvader, J., Weissman, I. L. & Wahl, G. M. 2006 Cancer stem cells–perspectives on current status and future directions: AACR Workshop on cancer stem cells. Cancer Res. 66, 9339–9344. (doi:10.1158/0008-5472.CAN-06-3126)
Clayton, E., Doupe´, D. P., Klein, A. M., Winton, D. J., Simons, B. D. & Jones, P. H. 2007 A single type of progenitor cell maintains normal epidermis. Nature 446, 185–189. (doi:10.1038/nature05574)
Conti, L. et al. 2005 Niche-independent symmetrical selfrenewal of a mammalian tissue stem cell. PLoS Biol. 3, e283. (doi:10.1371/journal.pbio.0030283)
De Luca, M., Pellegrini, G. & Green, H. 2006 Regeneration of squamous epithelia from stem cells of cultured grafts. Review. Regen. Med. 1, 45–57. (doi:10.2217/17460751.1.1.45)
Dick, J. E. 2008 Stem cell concepts renew cancer research. Blood 112, 4793–4807. (doi:10.1182/blood-2008-08-077941)
Dimos, J. T. et al. 2008 Induced pluripotent stem cells generated from patients with ALS can be differentiated into motor neurons. Science 321, 1218–1221. (doi:10.1126/science.1158799)
Dor, Y., Brown, J., Martinez, O. I. & Melton, D. A. 2004 Adult pancreatic beta-cells are formed by self-duplication rather than stem-cell differentiation. Nature 429, 41–46. (doi:10.1038/nature02520)
Dunnett, S. B., Bjo¨rklund, A. & Lindvall, O. 2001 Cell therapy in Parkinson’s disease—stop or go? Review. Nat. Rev. Neurosci. 2, 365–369. (doi:10.1038/35072572)
Evans, M. & Kaufman, M. 1981 Establishment in culture of pluripotential cells from mouse embryos. Nature 292, 154–156. (doi:10.1038/292154a0)
Gaspar, H. B. & Thrasher, A. J. 2005 Gene therapy for severe combined immunodeficiencies. Expert Opin. Biol. Ther. 5, 1175–1182. (doi:10.1517/14712598.5.9.1175)
Green, H. 2008 The birth of therapy with cultured cells. Bioessays 30, 897–903. (doi:10.1002/bies.20797)
Gurdon, J. B. & Melton, D. A. 2008 Nuclear reprogramming in cells. Review. Science 322, 1811–1815. (doi:10.1126/science.1160810)
Gurdon, J. B., Elsdale, T. R. & Fischberg, M. 1958 Sexually mature individuals of Xenopus laevis from the transplantation of single somatic nuclei. Nature 182, 64–65. (doi:10.1038/182064a0)
Hahn, W. C. &Weinberg, R. A. 2002 Modelling the molecular circuitry of cancer. Nat. Rev. Cancer 2, 331–341. (doi:10.1038/nrc795)
Hall, P. A. &Watt, F. M. 1989 Stem cells: the generation and maintenance of cellular diversity. Development 106, 619–633.
Hochedlinger, K., Yamada, Y., Beard, C. & Jaenisch, R. 2005 Ectopic expression of Oct-4 blocks progenitor-cell differentiation and causes dysplasia in epithelial tissues. Cell 121, 465–477. (doi:10.1016/j.cell.2005.02.018)
Hyun, I. et al. 2008 New ISSCR guidelines underscore major principles for responsible translational stem cell research. Cell Stem Cell 3, 607–609. (doi:10.1016/j.stem.2008.11.009)
Ivanova, N. B., Dimos, J. T., Schaniel, C., Hackney, J. A., Moore, K. A. & Lemischka, I. R. 2002 A stem cell molecular signature. Science 298, 601–604. (doi:10. 1126/science.1073823) ccc
Izumi, N., Era, T., Akimaru, H., Yasunaga, M. & Nishikawa, S. 2007 Dissecting the molecular hierarchy for mesendoderm differentiation through a combination of embryonic stem cell culture and RNA interference. Stem Cells 25, 1664–1674. (doi:10.1634/stemcells.2006-0681)
Jaenisch, R. & Young, R. 2008 Stem cells, the molecular circuitry of pluripotency and nuclear reprogramming. Cell 132, 567–582. (doi:10.1016/j.cell.2008.01.015)
Jensen, K. B. & Watt, F. M. 2006 Single-cell expression profiling of human epidermal stem and transit-amplifying cells: Lrig1 is a regulator of stem cell quiescence. Proc. Natl. Acad. Sci. USA 103, 11958–11963. (doi:10.1073/ pnas.0601886103)
Kamitakahara, M., Ohtsuki, C. & Miyazaki, T. 2008 Review paper: behavior of ceramic biomaterials derived from tricalcium phosphate in physiological condition. J. Biomater. Appl. 23, 197–212. (doi:10.1177/ 0885328208096798)
Kerr, C. L., Gearhart, J. D., Elliott, A. M. & Donovan, P. J. 2006 Embryonic germ cells: when germ cells become stem cells. Semin. Reprod. Med. 24, 304–313. (doi:10.1055/s-2006-952152)
Kim, J. B. et al. 2008 Pluripotent stem cells induced from adult neural stem cells by reprogramming with two factors. Nature 454, 646–650. (doi:10.1038/nature07061)
Lajtha, L. G. 1979 Stem cell concepts. Nouv. Rev. Fr. Hematol. 21, 59–65. Lau, D., Ogbogu, U., Taylor, B., Stafinski, T., Menon, D. & Caulfield, T. 2008 Stem cell clinics online: the direct-toconsumer portrayal of stem cell medicine. Cell Stem Cell 3, 591–594. (doi:10.1016/j.stem.2008.11.001)
Leblond, C. P. 1964 Classification of cell populations on the basis of their proliferative behavior. Natl. Cancer Inst. Monogr. 14, 119–150.
Lo Celso, C. et al. 2009 Live-animal tracking of individual haematopoietic stem/progenitor cells in their niche. Nature 457, 92–96. (doi:10.1038/nature07434)
Lowell, S., Benchoua, A., Heavey, B. & Smith, A. G. 2006 Notch promotes neural lineage entry by pluripotent embryonic stem cells. PLoS Biol. 4, e121. (doi:10.1371/journal.pbio.0040121)
Macchiarini, P. et al. 2008 Clinical transplantation of a tissue-engineered airway. Lancet 372, 2023–2030. (doi:10.1016/S0140-6736(08)61598-6)
Markoulaki, S. et al. 2009 Transgenic mice with defined combinations of drug-inducible reprogramming factors. Nat. Biotechnol. 27, 169–171. (doi:10.1038/nbt.1520)
Marson, A. et al. 2008 Connecting microRNA genes to the core transcriptional regulatory circuitry of embryonic stem cells. Cell 134, 521–533. (doi:10.1016/j.cell.2008.07.020)
Martin, G. 1981 Isolation of a pluripotent cell line from early mouse embryos cultured in medium conditioned by teratocarcinoma stem cells. Proc. Natl. Acad. Sci. USA 78, 7634–7638. (doi:10.1073/pnas.78.12.7634)
Mathur, D., Danford, T. W., Boyer, L. A., Young, R. A., Gifford, D. K. & Jaenisch, R. 2008 Analysis of the mouse embryonic stem cell regulatory networks obtained by ChIP-chip and ChIP-PET. Genome Biol. 9, R126. (doi:10.1186/gb-2008-9-8-r126)
Mavilio, F. et al. 2006 Correction of junctional epidermolysis bullosa by transplantation of genetically modified epidermal stem cells. Nat. Med. 12, 1397–1402. (doi:10.1038/nm1504)
McCulloch, E. A., Minden, M. D., Miyauchi, J., Kelleher, C. A. & Wang, C. 1988 Stem cell renewal and differentiation in acute myeloblastic leukaemia. Review. J. Cell Sci. Suppl. 10, 267–281.
Meissner, A. et al. 2008 Genome-scale DNA methylation maps of pluripotent and differentiated cells. Nature 454, 766–770.
Miller, R. A. & Ruddle, F. H. 1976 Pluripotent teratocarcinoma-thymus somatic cell hybrids. Cell 9, 45–55. (doi:10.1016/0092-8674(76)90051-9)
Morrison, S. J. & Spradling, A. C. 2008 Stem cells and niches: mechanisms that promote stem cell maintenance throughout life. Cell 132, 598–611. (doi:10.1016/j.cell. 2008.01.038)
O’Brien, C. A., Pollett, A., Gallinger, S. & Dick, J. E. 2007 A human colon cancer cell capable of initiating tumour growth in immunodeficient mice. Nature 445, 106–110. (doi:10.1038/nature05372)
Okita, K., Nakagawa, M., Hyenjong, H., Ichisaka, T. & Yamanaka, S. 2008 Generation of mouse induced pluripotent stem cells without viral vectors. Science 322, 949–953. (doi:10.1126/science.1164270)
Park, I. H., Zhao, R., West, J. A., Yabuuchi, A., Huo, H., Ince, T. A., Lerou, P. H., Lensch, M. W. & Daley, G. Q. 2008a Reprogramming of human somatic cells to pluripotency with defined factors. Nature 451, 141–146. (doi:10.1038/nature06534)
Park, I. H. et al. 2008b Disease-specific induced pluripotent stem cells. Cell 134, 877–886. (doi:10.1016/j.cell.2008.07.041)
Perry, A. R. & Linch, D. C. 1996 The history of bonemarrow transplantation. Blood Rev. 10, 215–219. (doi:10.1016/S0268-960X(96)90004-1)
Pike-Overzet, K., van der Burg, M., Wagemaker, G., van Dongen, J. J. & Staal, F. J. 2007 New insights and unresolved issues regarding insertional mutagenesis in X-linked SCID gene therapy. Mol. Ther. 15, 1910–1916. (doi:10.1038/sj.mt.6300297)
Potten, C. S. & Loeffler, M. 2008 Stem cells: attributes, cycles, spirals, pitfalls and uncertainties. Lessons for and from the crypt. Development 110, 1001–1020.
Quintana, E., Shackleton, M., Sabel, M. S., Fullen, D. R., Johnson, T. M. & Morrison, S. J. 2008 Efficient tumour formation by single human melanoma cells. Nature 456, 593–598. (doi:10.1038/nature07567)
Ramalho-Santos, M., Yoon, S., Matsuzaki, Y., Mulligan, R. C. & Melton, D. A. 2002 ‘Stemness’: transcriptional profiling of embryonic and adult stem cells. Science 298, 597–600. (doi:10.1126/science.1072530)
Reya, T., Morrison, S. J., Clarke, M. F. & Weissman, I. L. 2001 Stem cells, cancer, and cancer stem cells. Nature 414, 105–111. (doi:10.1038/35102167)
Sacco, A., Doyonnas, R., Kraft, P., Vitorovic, S. & Blau, H. M. 2008 Self-renewal and expansion of single transplanted muscle stem cells. Nature 456, 502–506. (doi:10.1038/nature07384)
Silva, J. & Smith, A. 2008 Capturing pluripotency. Cell 132, 532–536. (doi:10.1016/j.cell.2008.02.006)
Silva, J., Barrandon, O., Nichols, J., Kawaguchi, J., Theunissen, T. W. & Smith, A. 2008 Promotion of reprogramming to ground state pluripotency by signal inhibition. PLoS Biol. 6, e253. (doi:10.1371/journal. pbio.0060253)
Silva-Vargas, V., Lo Celso, C., Giangreco, A., Ofstad, T., Prowse, D. M., Braun, K. M. & Watt, F. M. 2005 b-Catenin and Hedgehog signal strength can specify number and location of hair follicles in adult epidermis without recruitment of bulge stem cells. Dev. Cell 9, 121–131. (doi:10.1016/j.devcel.2005.04.013)
Singh, S. K., Clarke, I. D., Hide, T. & Dirks, P. B. 2004 Cancer stem cells in nervous system tumors. Oncogene 23, 7267–7273. (doi:10.1038/sj.onc.1207946)
Stadtfeld, M., Nagaya, M., Utikal, J., Weir, G. & Hochedlinger, K. 2008 Induced pluripotent stem cells generated without viral integration. Science 322, 945–949. (doi:10.1126/science.1162494)
Takahashi, K. & Yamanaka, S. 2006 Induction of pluripotent stem cells from mouse embryonic and adult fibroblast cultures by defined factors. Cell 126, 663–676. (doi:10.1016/j.cell.2006.07.024)
Takahashi, K., Tanabe, K., Ohnuki, M., Narita, M., Ichisaka, T., Tomoda, K. & Yamanaka, S. 2007 Induction of pluripotent stem cells from adult human fibroblasts by defined factors. Cell 131, 861–872. (doi:10.1016/j.cell.2007.11.019)
Tesar, P. J., Chenoweth, J. G., Brook, F. A., Davies, T. J., Evans, E. P., Mack, D. L., Gardner, R. L. & Mckay, R. D. 2007 New cell lines from mouse epiblast share defining features with human embryonic stem cells. Nature 448, 196–199. (doi:10.1038/nature05972)
The´ry, M., Racine, V., Pe´pin, A., Piel, M., Chen, Y., Sibarita, J. B. & Bornens, M. 2005 The extracellular matrix guides the orientation of the cell division axis. Nat. Cell Biol. 7, 947–953. (doi:10.1038/ncb1307)
Thomson, J., Itskovitz-Eldor, J., Shapiro, S., Waknitz, M., Swiergiel, J., Marshall, V. & Jones, J. 1998 Embryonic stem cell lines derived from human blastocysts. Science 282, 1145–1147. (doi:10.1126/science.282.5391.1145)
Torres, J. & Watt, F. M. 2008 Nanog maintains pluripotency of mouse embryonic stem cells by inhibiting NFkappaB and cooperating with Stat3. Nat. Cell Biol. 10, 194–201. (doi:10.1038/ncb1680)
Watt, F. M. 1999 Stem cell manifesto. Book review. Cell 96, 470–473. (doi:10.1016/S0092-8674(00)80643-1)
Watt, F. M. & Collins, C. A. 2008 Role of b-catenin in epidermal stem cell expansion, lineage selection, and cancer. Cold Spring Harb. Symp. Quant. Biol. 73, 503–512. (doi:10.1101/sqb.2008.73.011)
Watt, F. M. & Hogan, B. L. 2000 Out of Eden: stem cells and their niches. Science 287, 1427–1430. (doi:10.1126/science.287.5457.1427)
Watt, F. M., Jordan, P. W. & O’Neill, C. H. 1988 Cellshape controls terminal differentiation of human epidermal keratinocytes. Proc. Natl. Acad. Sci. USA 85, 5576–5580. (doi:10.1073/pnas.85.15.5576)
Wernig, M., Meissner, A., Foreman, R., Brambrink, T., Ku, M., Hochedlinger, K., Bernstein, B. E. & Jaenisch, R. 2007 In vitro reprogramming of fibroblasts into a pluripotent ES-cell-like state. Nature 448, 318–324. (doi:10. 1038/nature05944)
Wilmut, I., Schnieke, A. E., McWhir, J., Kind, A. J. & Campbell, K. H. 1997 Viable offspring derived from fetal and adult mammalian cells. Nature 385, 810–813. [Erratum in Nature 1997 386, 200.] (doi:10.1038/385810a0).
Wright, B. L. & Barker, R. A. 2007 Established and emerging therapies for Huntington’s disease. Curr. Mol. Med.7, 579–587. (doi:10.2174/156652407781695738)
Xie, Y. et al. 2009 Detection of functional haematopoietic stem cell niche using real-time imaging. Nature 457, 97–101. (doi:10.1038/nature07639)
Yamanaka, S. 2007 Strategies and new developments in the generation of patient-specific pluripotent stem cells. Cell Stem Cell 1, 39–49. (doi:10.1016/j.stem.2007.05.012)
Yu, J. et al. 2007 Induced pluripotent stem cell lines derived from human somatic cells. Science 318, 1917–1920. (doi:10.1126/science.1151526)
Zaret, K. S. & Grompe, M. 2008 Generation and regeneration of cells of the liver and pancreas. Science 322, 1490–1494. (doi:10.1126/science.1161431)
Zhao, C., Deng, W. & Gage, F. H. 2008 Mechanisms and functional implications of adult neurogenesis. Cell 132, 645–660. (doi:10.1016/j.cell.2008.01.033)
Zhou, Q., Brown, J., Kanarek, A., Rajagopal, J. & Melton, D. A. 2008 In vivo reprogramming of adult pancreatic exocrine cells to beta-cells. Nature 455, 627–632. (doi:10.1038/nature07314)