Biology Forum Community General Discussion Stem Cells.. Help!! Pleease

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      In the term, ‘”lines” of stem cells’, what is the definition of “line”?.. Also, I have written in an article: ‘The ES cells (stem cells) are derived from an inner cell mass within that ball (blastocyst). Within six days, these ES cells would have received signalsinstructing them how to differentiate.’
      What is the nature of the “signals” which he is referring to?

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