Why do we hear much in the news about embryonic stem cells and very little about adult stem cells?
The first human embryonic stem cells were grown in vitro, in a petri dish, in the mid 1990s. Rapidly, scientists were successful at growing them for many generations and to trigger their differentiation into virtually any kind of cells, i.e. brain cells, heart cells, liver cells, bone cells, pancreatic cells, etc. When scientists tried growing adult stem cells, the endeavor was met with less success, as adult stem cells were difficult to grow in vitro for more than a few generations. This led to the idea that embryonic stem cells have more potential than adult stem cells. In addition, the ethical concerns linked to the use of embryonic stem cells have led to a disproportionate representation of embryonic stem cells in the media. But recent developments over the past 2-3 years have established that adult stem cells have capabilities comparable to embryonic stem cells in the human body, not in the test tube. Many studies have indicated that simply releasing stem cells from the bone marro
