From ZooTerms (Dictionary of Invertebrate Zoology)
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blastema (noun; plural blastemata; Greek blastema, bud): 1. Undifferentiated cells that later develop into an organ or structure. a. The part of an organism that gives rise to a new organism, as in asexual reproduction. b. That which often gives rise to regeneration of a lost part or appendage

See also: anlage.