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.
Like other stem cells which reside in pre-natal, adult tissues and organs, mesenchymal stem cells (MSCs; also known as multipotent mesenchymal stromal cells) are capable of self-renewal and multipotential differentiation.etal membranes and tissues as an MSC source: The umbilical cord and perinatal tissue are rich sources of stem cells. Multipotent stem cells have been found in the chorion, placenta, amnion, amniotic fluid, and in the tissue surrounding the umbilical cord vessels, i.e., Wharton's jelly, and in the umbilical cord itself.