A small population of UT-7/GM cells positively stained for hemoglobin ( Hb ) after a 7-day exposure to TPO .
a small population of ut-7/gm cells positively stained for hemoglobin ( hb ) after a 7-day exposure to tpo .
O O O O B-cell_line I-cell_line O O O B-protein_complex O B-protein_complex O O O O O O B-protein_molecule O