EVERYDAY SCIENCE

Detailed explanation-1: -Opponents argue that the research is unethical, because deriving the stem cells destroys the blastocyst, an unimplanted human embryo at the sixth to eighth day of development. As Bush declared when he vetoed last year’s stem cell bill, the federal government should not support “the taking of innocent human life.”

Detailed explanation-2: -However, human embryonic stem cell (hESC) research is ethically and politically controversial because it involves the destruction of human embryos. In the United States, the question of when human life begins has been highly controversial and closely linked to debates over abortion.

Detailed explanation-3: -Current ethical controversies regarding stem cell-based therapy are focused on the unlimited differentiation potential of iPSCs which can be used in human cloning, as a risk for generation of human embryos and human-animal chimeras.

Detailed explanation-4: -The stem cell controversy is the consideration of the ethics of research involving the development and use of human embryos. Most commonly, this controversy focuses on embryonic stem cells. Not all stem cell research involves human embryos.

Detailed explanation-5: -Ethical issues Many people disagree with using human embryonic cells for medical research because extracting them means destroying the embryo. This creates complex issues, as people have different beliefs about what constitutes the start of human life.