Embryonic Stem Cells Stem cells have the ability to transform into different types of cells. Stems cell hold the key to cell development and cell renewal and repair. Stem cells are derived from two sources. First, embryonic stem cells can be isolated from the inner mass of the blastocyst. These stem cells are considered pluripontential because they are undifferentiated, therefore have unlimited ability to transform into multiple cell lines which form multiple types of tissues. Somatic (Adult) Stem Cells Second type are called adult stem cells or somatic stem cells. These are the stem cells found embedded within all tissues of the body. They have the important function of healing, repair or development of cell lines (bone marrow stem cells developing into multiple types of blood cells). They are different from embrylogic stem cells in that they are found within the tissues of the body and have some differentiation toward those tissues. Stem
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