An element is a pure substance that is made from a single type of atom. Elements are the building blocks for all the rest of the matter in the world. Examples of elements include iron, oxygen, hydrogen, gold, and helium.
Since the initial discovery that the adult brain contains stem cells that generate new neurons, an important question in neurobiology has been whether or not this adult neurogenesis is functionally important.
Stem cellsâ value to researchers is that they can be induced into becoming specific tissue or organ cells. The cloning procedure works by combining a patient's body cell with an unfertilized egg cell from a donor. The patient's skin cell is inserted into the outer membrane of the egg cell and chemically induced to begin developing into a blastocyst. In the blastocyst, embryonic cells divide, producing a mass of stem cells. The stem cells can be induced to differentiate into different types of cells as needed (heart, nerve, muscle, etc.). These cells are genetically identical to the patient's own cells (that is, they are cloned).