A single-chain Fv ( sFv ) was expressed from the variable regions of the CD40-specific mAb G28-5 .
a single-chain fv ( sfv ) was expressed from the variable regions of the cd40-specific mab g28-5 .
O B-protein_molecule I-protein_molecule O B-protein_molecule O O O O O B-protein_domain_or_region I-protein_domain_or_region O O O B-protein_molecule I-protein_molecule O