?? ? ?? ??? ? ??? ?? ??? ??? ?? ??? ?? ?? ??? ???? ???? ???? ??? ?? ???? ???? ????? ??? ?? ??? ???? ????? ????? ???? ???? ? ?? ??? ???? ??? ?????. ?? ?? ?????? ???? ??? ???? ?? ?? ??? ???, ?? ???? ????? ???? ??? ????. ??? ??? ????? ?? ??? ??? ???? ????. ??? ???? ??? ??? ?? ???? ????? ??? ????

????? ? ??? ?? ??? ??? ? ?? ???? ???? ???? ??? ?? ????. ? ?? ??? ??? ???? ??? ?? ?? ??? ?? ????, ?? ?? ???? ???? ?? ?? ??? ???? ?? ??? ?? ??? ????. ??? ??? ???? ??? ?? ??? ?? ??? ???? ??? ???? ??? ?????? ????. ??? ??? ?? ???? ????, ??? ??? ???????. ?? ?? ?? ?? ????? ??? ??? ??? ?? ????? ???

In multicellular organisms, stem cells are undifferentiated or partly differentiated cells that may modify into various forms of cells and proliferate indefinitely to provide additional of the same stem cell. They are really the earliest variety of cell in a very cell lineage. ?? ???? ?? ?? ???,

??? ?? ?? ????? ??? ??? ?? ???? ???, ???? ? ????? ??? ??? ??? ?? ??????. ??? ?????? ?? ??? ??? ? ???? ??? ?? ???? ??? ????? ??? ? ??? ??? ???? ????? ????. ?? ???? ????. ??? ???? ?? ? ?? ???? ?? ??? ??, ??? ?? ??? ??? ?? ?? ????? ??, ???, ?? ?? ?? ??? ??? ???? ???~ ??? ???? ? ?????? ??

#????????#????????#???????#???????#??????#??????#?????#??????#??????#????????#????????#???????? ?? ??? ?? ??? ????? ??? ??? ? ?? ?? ??? ?? ???? ?????. ??? ???? ?? ??? ????, ?? ?? ?? ??? ?? ?? ??????. ??????? ??? ??????? ? ????? ???? ??? ??????? ??? ?? ? ???? ??? ? ??? ????? ??? ????? ??????