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Objectives: Tetraploid cells are strictly biologically inhibited from composition of embryos; by the same token, only diploid cells compose embryos. However, the distinction between diploid and tetraploid cells in development has not been well explained. To examine pluripotency of polyploid ES cells, a polyploid embryonic stem (ES)‐cell system was prepared.
Materials and methods: Diploid,...
Objectives: DNA content of diploid H1 (ES) cells (2H1 cells) has been shown to be stable in long‐term culture; however, tetraploid and octaploid H1 (ES) cells (4H1 and 8H1 cells, respectively) were DNA‐unstable. Pentaploid H1 (ES) cells (5H1 cells) established recently have been found to be DNA‐stable; how, then is cell DNA stability determined? To discuss ploidy stability, decaploid H1 (ES) cells...
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