For instance, if one was to be suffering from lung cancer, the embryonic stem cells could be used to create lung tissue cells, which would be injected into the lung, causing more tissue to be produced. Because the embryonic stem cell can be any type of cell that it is designated to be, and will continue to regenerate indefinitely, it will easily move into the organ, lung in this case, and without the possibility of being rejected, perform it' s function in that organ.

The way that this is carried out is that one would take the embryonic stem cells out of an approximately four-day-old embryo. After the embryonic stem cells have been separated, each is placed into a petri dish, in which they would become whatever type of cell that is in the dish with the embryonic stem cells, and regenerate into that type of cell to perform that function in the body.

In the experiment researched, dealing with a rat's crushed spinal cord, the embryonic stem cells were pretreated with retinoic acid and injected

directly into the crushed spinal cord to repair and/or replace any damaged nervous system cells in the spinal cord. Though nervous cells do not grow back naturally, the embryonic stem cells placed in the rats will continue growing indefinitely.

The purpose of the experiment researched, which took place at Washington University of Medicine in St. Louis, was to inject approximately one million embryonic stem cells pretreated with retinoic acid to induce the growth into nervous system cells into each of the 28 rats who's spinal cords were crushed, and see if the rats regained movement over a period of 2-5 weeks.

The advantage of using embryonic stem cells to help those in need is that stem cells do things that have never been possible in the science world before. Embryonic stem cells have the ability to ultimately rule out the possibility of becoming paralyzed or dying by cause of an injured spine.

The researcher feels that this experiment was done very well and as accurately as possible. Because the experiment used the steps of experimental design, few mistakes could have been made during this procedure. If the experiment were to be improved upon, one might have performed the experiment a few more times for more accurate data. One also might add more rats to make sure that the data is consistent and to provide more results for future researchers. The experiment researched was performed and designed excellently and will be of much help for researchers in the future.

Approximately two weeks later, the 28 rats, which received the injections of embryonic stem cells, regained the ability to walk very slowly and stand on all four legs. Upon further examination of the rats on week two and on week five, it was noticed that most of the stem cells had, in fact, died off

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