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What Are Stem Cells?

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Introduction:
What are stem cells? Stem cells are a multicellular organism that stems and roots from other cell types with a remarkable ability to divide and differentiate into all types of cells of which the human body is composed of. Stem cell has “become critical to the research of degenerative diseases, which have become much more common as the average human life-span has been extended beyond the once norm due to improved hygiene and medical care”. (Steinberg, 2007)
Generally, cells that are affected by diseases such as Parkinson’s and diabetes cannot be replaced. In the case of diabetes, the cells that produce insulin in the pancreas that have died or declined cannot produce insulin properly and cannot be replaced. On the other hand,
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Embryonic stem cells are also known as pluripotent cells and they can give rise to virtually any other type of cell in the body. The single-celled zygote, created after fertilization, marks the beginning of a human life. It rapidly divides into two cells which divide into two more, and the process continues until about 150 cells are present about five days after conception

Sources of Stem Cells:
There are several types of stem cells that can be used for different purposes, but as discussed adult and embryonic stem cells are the most widely used and discussed stem cell and these cells come from different and separate courses. According to www.elixcells.com, the main sources of adult stem cells are categorized into two different categories
The first source is Hematopoietic stem cells, which are blood related sources. These cells are self-renewal and of differentiation into any blood cell lineage. Some of examples of hematopoietic are Bone Marrow, Peripheral Blood and Umbilical Cord Blood. The second source is Mesenchymal stem cells, which are tissue related. These cells are “multipotent”, which means they can produce more than one type of specialized cell of the body; but not all types of cells in the body. Some examples of mesenchymal cells are Dental Pulp, Adipose Tissue, Umbilical Cord Tissue and Bone Marrow
The uses of embryonic stem cells has raised some ethical controversies. The reason for these controversies is due to
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