What are adult stem cells?

Adult stem cells are the reserve supply of cells that can multiply when needed for repair of adult organs and tissues. Skin is an example: skin wounds are repaired by skin stem cells, similarly, liver damage is repaired by liver stem cells. Adult stem cells start out as embryonic stem cells, then become fetal stem cells, and mature into adult stem cells.

For example, if it takes 20 maturation steps for an embryonic stem cell to turn into a mature skin cell, skin stem cells are at step 15; they are not quite mature skin cells, but they cannot back-up to become another cell type, such as a heart muscle cell. More.

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