Images of cell trees, cell lines, and cell fates: the legacy of Ernst Haeckel and August Weismann in stem cell research.


Stem cells did not become a proper research object until the 1960 s. Yet the term and the basic mind-set--namely the conception of single undifferentiated cells, be they embryonic or adult, as the basic units responsible for a directed process of development, differentiation and increasing specialisation--were already in place at the end of the nineteenth… (More)


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