<P> Stem cells are undifferentiated biological cells that can differentiate into specialized cells and can divide ( through mitosis ) to produce more stem cells . They are found in multicellular organisms . In mammals , there are two broad types of stem cells : embryonic stem cells , which are isolated from the inner cell mass of blastocysts , and adult stem cells , which are found in various tissues . In adult organisms , stem cells and progenitor cells act as a repair system for the body , replenishing adult tissues . In a developing embryo , stem cells can differentiate into all the specialized cells -- ectoderm , endoderm and mesoderm ( see induced pluripotent stem cells ) -- but also maintain the normal turnover of regenerative organs , such as blood , skin , or intestinal tissues . </P>
<P> Stem cells are undifferentiated biological cells that can differentiate into specialized cells and can divide ( through mitosis ) to produce more stem cells . They are found in multicellular organisms . In mammals , there are two broad types of stem cells : embryonic stem cells , which are isolated from the inner cell mass of blastocysts , and adult stem cells , which are found in various tissues . In adult organisms , stem cells and progenitor cells act as a repair system for the body , replenishing adult tissues . In a developing embryo , stem cells can differentiate into all the specialized cells -- ectoderm , endoderm and mesoderm ( see induced pluripotent stem cells ) -- but also maintain the normal turnover of regenerative organs , such as blood , skin , or intestinal tissues . </P>
where are stem cells located in the body
where are stem cells located in the body
embryonic stem cells , which are isolated from the inner cell mass of blastocysts adult stem cells , which are found in various tissues
embryonic stem cells , which are isolated from the inner cell mass of blastocysts adult stem cells , which are found in various tissues