We used expression cloning to identify interleukin-6 ( IL-6 ) as one factor that suppressed growth of a pre-B-cell variant line , 1A9-M .
we used expression cloning to identify interleukin-6 ( il-6 ) as one factor that suppressed growth of a pre-b-cell variant line , 1a9-m .
O O O O O O B-protein_molecule O B-protein_molecule O O O O O O O O O B-cell_line I-cell_line I-cell_line O B-cell_line O