anti-CD19 Molecule (CD19) antibody (PE-Cy7): The antibody detects: CD19 B-cell differentiation antigen, Mr 95 kDa Monoclonal antibody 6D5 recognizes the same epitope as the published clone, 1D3. To insure lot-to-lot consistency, each batch of monoclonal antibody is tested by flow cytometry to conform to characteristics of a standard reference reagent.