Nuclear behavior of embryonic cells and growing oocytes from the clawed toad in the cytoplasm of maturing axolotl oocytes

: The behaviour of the nuclei of the X. laevis vitellogenic oocytes was studied by their transplantation into the cytoplasm of the axolotl maturing oocytes. After the germinal vesicle breakdown, in the case the transplanted nuclei were located close to each other a common giant spindle united the chromosomes of all transplanted nuclei. A mosaic spindle united sometimes the chromosomes of the two amphibian species. The embryonic nuclei transplanted in the cytoplasm of the maturing oocytes formed, after the nuclear envelope breakdown, individual spindles, sometimes united in multipolar figures. Thus, the nuclei of different cell types, embryonic cells and germ cells, behave in a different way in the same environment, the cytoplasm of the maturing oocytes.