A. There are three main classes of stem cells: totipotent, multipotent, and pluripotent.
Totipotent: it has the potential to become all other types of cells in the body. A fertilized egg is totipotent.
Multipotent: a small number of stem cells can produce only certain types of cells.
Pluripotent: stem cells that produce any type of cell in the body except those needed to develop a fetus.
