tokens: In vitro studies on hematopoietic control mechanisms have been hampered by the heterogeneity of the analyzed cell populations , ie , lack of lineage specificity and developmental stage homogeneity of progenitor/precursor cells growing in culture .
folded_tokens: in vitro studies on hematopoietic control mechanisms have been hampered by the heterogeneity of the analyzed cell populations , ie , lack of lineage specificity and developmental stage homogeneity of progenitor/precursor cells growing in culture .
labels: O O O O B-other_name I-other_name I-other_name O O O O O O O O O O O O O O O O O O O B-other_name I-other_name I-other_name O B-cell_type I-cell_type O O O O