(Of an immature or stem cell) capable of giving rise to any cell type or (of a blastomere) a complete embryo.
- For the first few divisions, up to at least the 8-cell stage, all the cells of the tiny embryo are totipotent stem cells.
- Here, human or mouse embryonic stem cells, in vitro representatives of the totipotent inner cell mass blastomeres, are placed into culture.
- What he showed next were a series of experiments in which they pushed cultured, totipotent mouse embryonic stem cells to desired neural fates using the various factors he had identified as significant in vivo.
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