Lecanemab (Mouse IGG2a) is a monoclonal antibody that targets soluble β-amyloid and has the potential to reduce cognitive decline. The variable region of Lecanemab (Mouse IGG2a) is consistent with that of Lecanemab, while the constant region is of Mouse IGG2a sequence. Lecanemab (Mouse IGG2a) holds promise for research in the field of Alzheimer's disease.