A majority of suppliers have reported the clone MAC387 to be a mouse monoclonal antibody specific to the human gene, S100A8, or S100 calcium binding protein A8. Other suppliers describe clone MAC387 to be a mouse monoclonal antibody against human S100A9, or S100 calcium binding protein A9. Indicated applications for antibody clone MAC387 include immunohistochemistry, flow cytometry, immunofluorescence, and blocking/inhibition.