There are several different types of stem cells in the human body, each with varying levels of utility. Stem cells are useful in research in not only the human body, but in how to treat many different kinds of medical conditions, such as cancer, diabetes, neurological disorders. Stem cells have even been used to repair tissue damage from disease or age. Pluripotent stem cells, or embryonic stem cells, come from the inner cell mass of the blastocyst, an embryo about 5 days into fertilization. Due to the high likelihood of the embryo being destroyed in the process of cell extraction, their production and use in research has been a controversial
