Assertion: embryo's cell | /r/CapableOf | maintain normal karyotypes
Facets:
Source sentences:
text: They grow EG cells in vitro for approximately 20 passages, and the cells maintain normal karyotypes.
text: The cells are cultured through many passages, retain their normal karyotypes, maintain high levels of telomerase activity, and express a panel of markers typical of human EC cells non-human primate ES cells.