"Blood and marrow stem cell transplantation has been a mainstay treatment for patients with high risk leukemia and other hematological malignancies for the past 30 years. ... Now, UCB [umbilical cord blood] is routinely used throughout the world as an alternative to bone marrow transplantation."As I've mentioned previously, embryonic stem cells are technically difficult to produce (in addition to the moral evil involved in production).
On the other hand, adult stem cells source are plentiful (liposuction mentioned in that link, and umbilical cord blood here).
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