抄録
Several early-gastrula nuclei from Rana nigromaculata, R. brevipoda, R. japonica, R. rugosa, Hyla arborea japonica, Bombina orientalis, Xenopus laevis or Cynops pyrrhogaster were transplanted into an unfertilized or enucleated R. nigromaculata egg. Immediately after the nuclear transplantation, 3H-thymidine was injected into these eggs. The behavior of the transplanted nuclei and the incorporation of 3H-thymidine by them were examined.
All the transplanted nuclei swelled remarkably in a great majority of the eggs transplanted with nuclei from each of the four Rana species or Hyla as well as in a small number of eggs transplanted with Bombina or Xenopus nuclei. There was a mixture of swollen and degenerative nuclei in a small number of eggs transplanted with Rana or Hyla nuclei as well as in many eggs transplanted with Bombina or Xenopus nuclei. In a small number of eggs transplanted with Bombina or Xenopus nuclei as well as in all the eggs transplanted with Cynops nuclei, the transplanted nuclei were all degenerative.
No remarkable difference was found in the amount of 3H-thymidine incorporation by each nucleus between swollen nuclei from different species.
