We conclude that CD28 costimulation can cause substantial T cell proliferation in the absence of IL-2 , which is driven by a soluble factor independent of NF-AT transactivation .
we conclude that cd28 costimulation can cause substantial t cell proliferation in the absence of il-2 , which is driven by a soluble factor independent of nf-at transactivation .
O O O B-protein_molecule O O O O B-other_name I-other_name I-other_name O O O O B-protein_molecule O O O O O O B-protein_family_or_group I-protein_family_or_group O O B-protein_molecule O O