"For a variety of reasons, many believe research advancement requires new embryonic stem cell lines, and for certain applications, stem cells derived from cloned embryos may offer the best hope for progress in understanding and treating disease. A significant cohort of pro-life advocates support stem cell research; those opposed are concerned that the isolation of stem cells requires the destruction of embryos. Some have argued that stem cell research be limited to adult stem cells obtained from tissues such as bone marrow or umbilical cord blood. They argue that adult stem cells should be pursued instead of embryonic stem cells because they believe the derivation of stem cells from either embryos or aborted fetuses is ethically unacceptable. Other scientists believe adult stem cells should not be the sole target of research because of important scientific and technical limitations. Some scientists are exploring the possibility of obtaining human embryonic stem cells that bypass the destruction of living human embryos." Source : Congressional Research Service
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