Campbell, K. H. S., McWhir, J., Ritchie, W. A. & Wilmut, I. Sheep cloned by nuclear transfer from a cultured cell line. Nature 380, 64–66 (1996).
Solter, D. Lambing by nuclear transfer. Nature 380, 24–25 (1996).
Gurdon, J. B., Laskey, R. A. & Reeves, O. R. The developmental capacity of nuclei transplanted from keratinized skin cells of adult frogs. J. Embryol. Exp. Morph. 34, 93–112 (1975).
Quinlivan, T. D., Martin, C. A., Taylor, W. B. & Cairney, I. M. Pre- and perinatal mortality in those ewes that conceived to one service. J. Reprod. Fert. 11, 379–390 (1966).
Walker, S. K., Heard, T. M. & Seamark, R. F. In vitro culture of sheep embryos without co-culture: successes and perspectives. Therio 37, 111–126 (1992).
Nash, M. L., Hungerford, L. L., Nash, T. G. & Zinn, G. M. Risk factors for perinatal and postnatal mortality in lambs. Vet. Rec. 139, 64–67 (1996).
Bradford, G. E., Hart, R., Quirke, J. F. & Land, R. B. Genetic control of the duration of gestation in sheep. J. Reprod. Fert. 30, 459–463 (1972).
Walton, A. & Hammond, J. The maternal effects on growth and conformation in Shire horse-Shetland pony crosses. Proc. R. Soc. B 125, 311–335 (1938).
Campbell, K. H. S., Loi, P., Otaegui, P. J. & Wilmut, I. Cell cycle co-ordination in embryo cloning by nuclear transfer. Rev. Reprod. 1, 40–46 (1996).
Cheong, H.-T., Takahashi, Y. & Kanagawa, H. Birth of mice after transplantation of early-cell-cycle-stage embryonic nuclei into enucleated oocytes. Biol. Reprod. 48, 958–963 (1993).
Prather, R. S. et al. Nuclear transplantation in the bovine embryo. Assessment of donor nuclei and recipient oocyte. Biol. Reprod. 37, 859–866 (1987).
McGrath, J. & Solter, D. Inability of mouse blastomere nuclei transferred to enucleated zygotes to support development in vitro. Science 226, 1317–1318 (1984).
Robl, J. M. et al. Nuclear transplantation in bovine embryos. J. Anim. Sci. 64, 642–647 (1987).
Campbell, K. H. S., Ritchie, W. A. & Wilmut, I. Nuclear-cytoplasmic interactions during the first cell cycle of nuclear transfer reconstructed bovine embryos: Implications for deoxyribonucleic acid replication and development. Biol. Reprod. 49, 933–942 (1993).
Barnes, F. L. et al. Influence of recipient oocyte cell cycle stage on DNA synthesis, nuclear envelope breakdown, chromosome constitution, and development in nuclear transplant bovine embryos. Mol. Reprod. Dev. 36, 33–41 (1993).
Kwon, O. Y. & Kono, T. Production of identical sextuplet mice by transferring metaphase nuclei from 4-cell embryos. J. Reprod. Fert. Abst. Ser. 17, 30 (1996).
Gurdon, J. B. The control of gene expression in animal development (Oxford University Press, Oxford, 1974).
Finch, L. M. B. et al. Primary culture of ovine mammary epithelial cells. Biochem. Soc. Trans. 24, 369S (1996).
Whitten, W. K. & Biggers, J. D. Complete development in vitro of the preimplantation stages of the mouse in a simple chemically defined medium. J. Reprod. Fertil. 17, 399–401 (1968).
Gardner, D. K., Lane, M., Spitzer, A. & Batt, P. A. Enhanced rates of cleavage and development for sheep zygotes cultured to the blastocyst stage in vitro in the absence of serum and somatic cells. Amino acids, vitamins, and culturing embryos in groups stimulate development. Biol. Reprod. 50, 390–400 (1994).
Breslow, N. E. & Clayton, D. G. Approximate inference in generalized linear mixed models. J. Am. Stat. Assoc. 88, 9–25 (1993).
Buchanan, F. C., Littlejohn, R. P., Galloway, S. M. & Crawford, A. L. Microsatellites and associated repetitive elements in the sheep genome. Mammal. Gen. 4, 258–264 (1993).