CD28 is a T-cell surface molecule and stimulation through this protein plays an important role in delivering the second activation signal .
cd28 is a t-cell surface molecule and stimulation through this protein plays an important role in delivering the second activation signal .
B-protein_molecule O O B-protein_molecule I-protein_molecule I-protein_molecule O O O O O O O O O O O O B-other_name I-other_name I-other_name O