However IL-7 , a crucial factor for thymopoiesis that is secreted mainly by TEC , is a necessary cofactor for NF-kappaB activation elicited by TNF or IL-1 .
however il-7 , a crucial factor for thymopoiesis that is secreted mainly by tec , is a necessary cofactor for nf-kappab activation elicited by tnf or il-1 .
O B-protein_molecule O O O O O O O O O O O B-cell_type O O O O O O B-protein_complex O O O B-protein_family_or_group O B-protein_molecule O