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Stem-cells are primitive cells which are present in different parts of the body such as bones, umbilical cord, placenta, embryo, teeth etc. For years scientists all over the world have been working on possibilities of using these Stem-cells to regenerate human cells which are damaged due to illness, developmental defects and accidents. In fact, stem-cells can create replacement cells for those that are lost or damaged by injury or disease.doi:10.5368/aedj.2012.4.2.4.4 fatcat:sujwmj2hzvdmfiqe77y7bq4zia