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Solution:

Stem cells are the cells that have the capability to become any kind of cell. They are undifferentiated i.e. their functions are not decided. They can regenerate and produce different types of cell. They are capable to produce cells that can perform different function in different parts of body. Stem cell also has the ability of self renewal so it can divide  and produce exact copy of itself .

Reasearch in Stem cell therapy is a promising field of research. 

Stem cell therapy is a procedure to introduce stem cells into damaged or diseased tissue for the treatment of disease. As we know stem cells have capability to self renew and producing cell with different functions, this property of stem cell is used in stem cell therapy. The stem cells help in replacing the diseased or damaged tissue to cure the disease by producing new cells.