While the principal source of the controversy surrounding HESC research lies in competing views about the value of human embryonic life, the scope of ethical issues in HESC research is broader than the question of the ethics of destroying human embryos. It also encompasses questions about, among other things, whether researchers who use but do not derive HESCs are complicit in the destruction of embryos, whether there is a moral distinction between creating embryos for research purposes and creating them for reproductive ends, the permissibility of cloning human embryos to harvest HESCs, and the ethics of creating human/non-human chimeras.
https://plato.stanford.edu/entries/stem-cells/
There are particular considerations depending on the types of cells collected and used for stem cell research and treatment, including umbilical cord blood, bone marrow, and other somatic cells. Many of these considerations have been described in different literatures, but reviewing them in aggregate suggests some crosscutting concerns regarding the use of human tissue for stem cell research. Further, awareness of the concerns and how they have been managed with respect to particular cell types may provide useful lessons and analogies for other cell types. Umbilical cord blood
https://linkinghub.elsevier.com/retrieve/pii/S1934590908002191
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