Embryonic stem cells (can turn into any type of cell)

• undifferentiated cells (stem cells) can divide to produce lots more undifferentiated cells. They differentiate into different types of cells, depending on what instructions they're given
• Stem cells are found in early human embryos. They're exciting to doctors and medical researchers because they have potential to turn into any kind of cell
• Adults have stem cells, but they're found in certain places e.g. bone marrow
• Adult stem cells can't turn into any cell type - only certain ones, such as blood cells
• Stem cells from embryos and bone marrow can be grown ina lab to produce clones (genetically identical cells) and made to differentiate into specialised cells to use in medicine or research