even after enrichment , the morphology of haemopoietic stem- and colony-forming cells only remained hypothetical , 'candidate stem cells ' [ 3 ] , because their precursor cell qualities could not be deduced from their morphology , but only retrospectively , and statistically from their function , i.e . in vitro colony-formation or in-vivo haemopoietic reconstitution from an enriched cell suspension [ 58 ] .
C0007634
cells
C0018956
precursor cell