Immunohistochemistry of Kappa Light Chain in paraffin-embedded human appendix tissue. The section was pre-treated using heat mediated antigen retrieval with Tris-EDTA buffer (pH 9.0) for 20 minutes. The tissues were blocked in 1% BSA for 20 minutes at room temperature, washed with ddH2O and PBS, and then probed with Kappa Light Chain monoclonal antibody (Product # MA5-50617) with a dilution of 1:500 for 1 hour at room temperature. The detection was performed using an HRP conjugated compact polymer system. DAB was used as the chromogen, and tissues were counterstained with hematoxylin and mounted with DPX.