thus , the current studies establish a remarkable similarity between the hematopoietic microenvironment in the short-term cfu-f assay and the long-term culture system : the majority of adherent cells are hematopoietic cells of the monocyte-macrophage lineage , while the remainder are stromal cells whose precise lineage remains uncertain , but whose pattern of collagen expression is more consistent with an endothelial rather than a fibroblast cell origin .
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the
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fibroblast cell