| abstract |
PROBLEM TO BE SOLVED: To provide an antibody or an antibody fragment for treating and diagnosing a disease such as cancer and an infectious disease. An antibody or antibody fragment that does not bind to the immunoglobulin V (IgV) domain of a human programmed cell death ligand 1 (PD-L1) protein but can specifically bind to the immunoglobulin C (IgC) domain. [Selection diagram] None |