https://en.wikipedia.org/wiki/Monoclonal_antibody
WebA monoclonal antibody (mAb, more rarely called moAb) is an antibody produced from a cell line made by cloning a unique white blood cell.All subsequent antibodies derived this way trace back to a unique parent cell. Monoclonal antibodies can have monovalent affinity, binding only to the same epitope (the part of an antigen that is recognized by the antibody).