Cord Blood Stem Cells Information - Would embryonic stem cells, derived from an aborted fetus and cultured in the laboratory?

Would embryonic stem cells, derived from an aborted fetus and cultured in the laboratory?

Would embryonic stem cells, derived from an aborted fetus and cultured in the laboratory, be an acceptable substitute?

if it comes from a fetus, the cells would already have differentiated and not be the embryonic stem cells researchers use when using embryos
It just occurred to me that, while it is true that by the time an embryo has matured to the stage of being a fetus, its own embryonic stem cells, ESCs, has differentiated into other more mature forms of cells, tissues, and organ systems and wouldn't show natural ESC characteristics. However, if the fetus was female, by the time the female embryo has matured into a fetus, there would be around 700,000 immature primary Oocysts that could be collected and manipulated in the lab (matured to the Ova stage) and activated parthenogenetically in order to produce viable ESCs, could be used for research and possibly for medical application. See: oogenesis definition http://dictionary.reference.com/browse/oogenesis See: Cell Research Human parthenogenetic stem cells http://www.nature.com/cr/journal/v18/n1s/full/cr2008113a.html