Jun 08, · Adult stem cells. These stem cells are found in small numbers in most adult tissues, such as bone marrow or fat. Compared with embryonic stem cells, adult stem cells have a more limited ability to give rise to various cells of the body. Until recently, researchers thought adult stem cells could create only similar types of cells. Stem cell therapy used to involve embryonic cells, which understandably generated a lot of controversy. Today’s research focuses on non-embryonic adult mesenchymal stem cells—and there is nothing controversial about using your own cells in a safe and therapeutic manner. Adult stems cells may be derived from bone marrow.