Interleukin-6 ( IL-6 ) is an important B-cell growth and differentiation factor .
interleukin-6 ( il-6 ) is an important b-cell growth and differentiation factor .
B-protein_molecule O B-protein_molecule O O O O B-protein_family_or_group I-protein_family_or_group I-protein_family_or_group I-protein_family_or_group I-protein_family_or_group O