"What are stem cells and what are they used for?". April 24, 2001 http://health.howstuffworks.com/question621.htm (January 17, 2007)

After researching this website for more information on stem cell research, I have found out that there are four different types of stem cells. They are embryonic which are taken from human embryos, fetal which are taken from aborted fetus', umbilical-taken from umbilical cords, and adult- taken from adult stem cells. Stem cells have the capibility of becoming new types of cells such as bone, muscle, and cartilage cells. While embryonic and fetal cells can created a bigger variety of stem cells, adult cells do not.
The process of differentiation is mentioned in the site. It happens before they replant them. Scientists specialize the cells to preform a specific function.

Questions to be answered:
-Do the four different types of stem cells work better than one another?