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A [[Stem Cell]] is an [[Undifferentiated Cell|undifferentiated cell]] which has not yet been [[Specialised Cell|specialised]] in an [[organism]].

: In [[animal]]s '''stem cells''' are divided into two groups; '''juvenile stem cells''' which are found in [[embryo]]s before the [[Cell (Biology)|cells]] have begun to [[Specialised Cell|specialise]] and '''adult stem cells''' which are found in adults and can only [[Specialised Cell|specialise]] into certain [[Cell (Biology)|cells]] such as [[Blood Cell|blood cells]].

: In [[plant]]s '''stem cells''' are found in the [[shoot]] tips and [[root]] tips and are usually the only [[Cell (Biology)|cells]] which can divide.