Clone SPM554 is a mouse monoclonal antibody specific to the human gene, CR1, or Complement C3b/C4b receptor 1 (Knops blood group). Another name for the gene is CD35. This antibody clone has been reported to also recognize the primate ortholog of the target gene. Indicated applications for antibody clone SPM554 include Western blot, immunohistochemistry, flow cytometry, immunofluorescence, ELISA, immunocytochemistry, and immunoprecipitation.