For almost half a century, scientists have been fervently researching and studying a possible answer to many severe health problems such as cancer, spinal chord injuries, heart disease, Parkinson’s disease, and many others. This possible answer lies in a type of cell called a stem cell. Stem cells are a special type of cell that can regenerate themselves and develop into other types of cells, like muscle tissue for example. The study of stem cells was begun by two Canadian scientists named Earnest A. McCulloch and James E. Till in the 1960’s when the two were experimenting with bone marrow transplants in mice. There are two different types of stem cells: embryonic and adult. Embryonic stem cells come from unborn fetuses. Adult stem cells don’t necessarily have to come from actual adults, they can be found in any human body that is already developed.
There are other differences between embryonic and adult stem cells as well. Embryonic stem cells are more likely to be......

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Title: Stem Cell Research
Approximate Word Count: 821
Approximate Pages: 4 (250 words per double-spaced page)

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