Thank you for your question. The significant majority of mouse monoclonal IgG primary antibodies (98%) have a kappa light chain. And therefore we would recommend using our mouse IgG kappa binding protein (m-IgGκ BP) conjugated to Horseradish Peroxidase (HRP): sc-516102 for Western blotting or immunohistochemistry.
Only approximately 2% of mouse IgG contains a lambda light chain, but for those subtypes we do offer a lambda-specific mouse IgG binding protein, m-IgGλ BP-HRP: sc-516132.
Date published: 2018-09-13