passages.id: split_6_test_117_passage
passages.type: progene_text
passages.text: Human cord blood CD34 ( + ) stem cells were allowed to differentiate in the presence of cytokines stem cell factor ( SCF ) , granulocyte - macrophage colony - stimulating factor ( GM-CSF ) and tumour necrosis factor alpha ( TNF-alpha ) into functional CD1a + dendritic cells ( DC ) .