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Adult stem cells are undifferentiated cells that exist throughout the human body.  They can divide to replenish dying cells, and also regenerate to repair damaged tissues.  An example are olfactory cells in the nasal passages, which replenish to restore the sense of smell after suffering a cold.

'''Adult stem cells''' are undifferentiated cells that exist throughout the human body.  They can divide to replenish dying cells, and also regenerate to repair damaged tissues.  An example are olfactory cells in the nasal passages, which replenish to restore the sense of smell after suffering a cold.

Researchers have found a certain type of adult stem cells that may be able to be converted into those of other types, making adult stem cells as useful as [[embryonic stem cells]].  For example, adult stem cells have been able to turn marrow cells into heart muscle and blood vessels in rats.<ref>http://www.usccb.org/prolife/issues/bioethic/fact401.htm</ref>

Researchers have found a certain type of adult stem cells that may be able to be converted into those of other types, making adult stem cells as useful as [[embryonic stem cells]].  For example, adult stem cells have been able to turn marrow cells into heart muscle and blood vessels in rats.<ref>http://www.usccb.org/prolife/issues/bioethic/fact401.htm</ref>