Crossword Genius

Versatile building block of life (4,4)

Ross

I believe the answer is:

stem cell

<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">versatile building block of life</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>

(Other definitions for stem cell that I've seen before include "Generalised producer in living organism" , "Undifferentiated functional unit in an organism" , "biological germ" , "Undifferentiated unit of life" , "body-builder" .)

I've seen this clue in The Times.
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