| Popis: |
The fertilized mouse eggs obtained after the hormonal stimulation of the females were denuded by pronase and incubated for 1 h at 37 degrees in the culture medium with cytochalasin B (5 micrograms/ml) and, then, centrifuged 20 min (12,000 g) at ca. 31 degrees in Ficoll gradient added with cytochalasin B. Under these conditions the eggs were divided in anuclear (cytoplasts) and nuclear (karyoplasts) fragments. The cytoplasts kept their shape and ability for protein synthesis during cultivation and the karyoplasts performed one cell division. The viable cyto- and karyoplasts obtained from the eggs may be used in the experiments on cell hybridization and production of embryos-cybrids. |
