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  Stem cells are the cells that have an ability to become various types of cells. They are present both during embryonic development (embryonic stem cells) and in the adult body (adult stem cells).

For the first time, biologists have succeeded in growing human stem cells in pig embryos, shifting from science fiction to the realm of the possible the idea of developing human organs in animals for later transplant.

In this interactive activity adapted from the HHMI Outreach Program at Harvard University, learn about the ways in which stem cells can be used to treat and help cure diseases in humans. The activity explains what stem cells are and how they're produced, and provides details on their existing or potential therapeutic role in diseases related to the pancreas, liver, lungs, and bone marrow.