1. Akers, R. M., Phillips, C. R., and Wessells, N. K., 1986, Expression of an epidermal antigen used to study tissue induction in the early Xenopus laevis embryo, Science 231:613–616.
2. Anderson, K. V., and Nusslein-Volhard, C., 1984, Information for the dorso-ventral pattern of the Drosophila embryo is stored as maternal mRNA, Nature (Lond.) 311:223–227.
3. Asashima, M., and Grunz, H., 1983, Effects of inducers on inner and outer gastrula and ectoderm layers of Xenopus laevis, Differentiation 23:206–212.
4. Azar, Y., and Eyal-Giladi, H., 1981, Interaction of epiblast and hypoblast in the formation of the primitive streak and the embryonic axis in chick, as revealed by hypoblast-rotation experiments, J. Embryol. Exp. Morphol. 61:133–144
5. Balak, K., Jacobson, M., Sunshine, J., and Rutishauser, U., 1987, Neural cell adhesion molecule expression in Xenopus embryos.Dev. Biol. 119:540–550.