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.
Adult Stem Cells Cells present in adult tissues that generate replacements for nondividing differentiated cells that can be of great therapeutic potential. What is the difference between embryonic and adult stem cells?