An embriyonic stem cell or human bone marrow stem cell.it is said embryonic stem cells have capacity to diferantie 250 cell types.for instance pancreas cell can not be generated from bone marrow stem cells because of bone marrow stem cells can be differantied into at the very most 15 cell type.when embriyonic stem cell compared with human bone marrow stem cells current state seems like an advantage but also it has some desadvantage such as laws because the embryos are unborn child and they have right to life and also they have families.there must be obtain approvel with the family.there is another problem with embryos' dna and the human enjected stem cells whose dna.in the future there can be a huge problem because of dna mismatch.