loning both human and other mammal's embryos only to see how far they can push the scientific envelope, but in fact there are many legitimate reasons for investigating cloning. Embryologists believe that research into cloning could help improve the life of future generations. Cancer research is possibly the most important reason for embryo cloning they argue. Oncologists believe that embryonic study will advance understanding of the rapid cell growth of cancer. Cancer cells develop at approximately the same phenomenal speed as embryonic cells do. By studying the embryonic cell growth, scientists may be able to determine how to stop rapid cell division, and also stop cancer growth in turn (Hyde 15). Another important area of embryo cloning research is embryonic stem cell development. Stem cells are undifferentiated cells that can develop into almost any type of cell in the body. These cells are not attacked by a person's immune system, because of their fast development and undifferentiated status (Wilmut 4). Many doctors believe that these stem cells could be used in treatments for brain and nervous system damage. Perhaps a more questionable use of cloned embryos is for spare parts and hormones. Production of transgenic farm animals to make organs to transplant in humans with organ failure has been heavily researched. Companies like Alexion Pharmaceutical have been working on the development of "pigs to grow hearts and kidneys that won't be rejected in transplants" (Reibstein 58). For example, the cells used to generate tissues for transplantation could include skin and blood cells for treatments of burn and other injuries, bone marrow transplants for leukemia patients, and neurological tissues for degenerative neurological diseases like Parkinson's and Alzheimer's (Winston 913). Obviously human embryo cloning is a great source for human advancement, and it is the technology that will finally make it possible to apply genetic engineering...
