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Mesenchymal stromal stem cells (MSC) can be found in almost any adult organ. They can be isolated and expanded within several weeks up to hundreds of millions of cells. The cell isolation based on the surface antigen expression may significantly enrich for the desired cell population and reduce the time required for cell expansion. MSC display a unique molecular signature which clearly discriminates them from other stem cell types. MSC can be differentiated into the cells of several lineages. Additionally, the unique biological properties of MSC are mediated by strong immunomodulatory activity and by paracrine mechanisms. Potential therapeutic applications of the cells require clinically compliant protocols for cell isolation and expansion. The therapeutic utility of MSC has been evaluated and found to be useful in several pre-clinical animal models as well as in clinical trials. [ABSTRACT FROM AUTHOR]