Used in immunological research to detect and quantify CD22 protein levels in biological samples. Commonly applied in studies involving B-cell function, immune regulation, and autoimmune diseases. Supports research in cancer immunology, particularly in B-cell malignancies and therapeutic antibody development. Enables accurate measurement of CD22 expression in cell cultures, serum, or tissue lysates. Widely used in preclinical studies and drug discovery to assess target engagement and immune response modulation.