The House of Representatives have placed bans on certain aspects of cloning limiting the amount of funds for research on human cloning. Cloning has become a very controversial issue. Many people argue over when life begins which has sparked conflict in the scientific and religious community. Some people think that using an embryo for medical research in cloning is tampering with a life. This issue could bring ab

The embryonic stem cells have the advantage of adult stems cells due to the fact of its multi-potency. (Stem cells, 41) Embryonic stem cells are found in the cell mass of the human blastocyst, an early stage of the developing embryo lasting from the fourth to the seventh day of fertilization. The stem cells can be extracted from the inner cell during the blastocyst stage. (Stem cells, 31-43) Hematopoictic stem cells can be found in the fetal liver, spleen, umbilical cord and in placenta blood. Hematopoictic stem cells are the few stem cells to be isolated in adult humans. Stem cells can also be used as a way to replace organs There is a growing body of evidence that Hematopoictic stem cells are plastic that, at least under some, circumstances they are able to participate in the generation of tissues other than those in blood. Hematopoictic stem cells can also reproduce liver cells. (Stem cells, 19) New organs created by stem cells can also replace defective organs in the human body. (Lamb, 12)

Some topics in this essay:
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