Stem cells are specialized cells in humans that are able to develop into many other cell types. These are the cells that do not have a specific job yet.
Stem cells are ubiquitous in the body, present in many different organs and tissues including the brain, blood, muscle, skin, heart, bone marrow, and liver tissues.
Here they generally lie inactive until needed to regenerate lost or damaged tissue.
Thus, it can be concluded that stem cells are the cells that do not have specific job yet.
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