Clone 18D4 has been reported to be a mouse monoclonal antibody specific to the human gene, DSG1, or Desmoglein 1. Other suppliers describe clone 18D4 to be a mouse monoclonal antibody against human PLK1, or polo like kinase 1. Indicated applications for antibody clone 18D4 include Western blot, flow cytometry, immunofluorescence, ELISA, and immunoprecipitation.