tokens: Cyclin A was observed after 4 days of costimulation with anti CD2 + CD28 whereas stimulation by anti CD2 or anti CD28 alone was not effective .
folded_tokens: cyclin a was observed after 4 days of costimulation with anti cd2 + cd28 whereas stimulation by anti cd2 or anti cd28 alone was not effective .
labels: B-protein_molecule I-protein_molecule O O O O O O O O B-protein_family_or_group B-protein_molecule O B-protein_molecule O O O B-protein_family_or_group B-protein_molecule O B-protein_family_or_group B-protein_molecule O O O O O