Some facts on ESCR
Embryos carry the DNA that change two independent cells into a new human being. The amount of change required for the first nine months of that growth is probably orders of magnitude more than the change in cells from birth to a centenarian's death.
Sometimes the earliest cells divide into twins, and sometimes this division is incomplete and results in one living child, born with a tumor that contains what tried to be a second child, but whose genetic message was faulty. (Please excuse the non-scientific language. I am trying to express this background simply.)
Scientists who are rooting for success with ESCR look only at the potential of the early cells to transform into every kind of cell that could be desired. They refuse to look at the fact that these cells are so powerful that they cannot be guided into making the specific tissue requested.
The more mature (by nine months of division) umbilical blood cell has much more potential to be safely guided into making particular cells.
Cells taken from the umbilical cord blood of a newborn have already "evolved" for nine months, and thus are called "adult" stem cells.
Interesting. Very, very interesting.
#202, and that may explain why they create Tumors in the subjects of these experiments who already are compromised with serious disease or some severe malady.