B220, CD 45, CD-45, cd45 antigen, ec3.1.3.48, CD45R, GP180, GP180, GP 180, L CA, LCA, L-CA, Leukocyte common antigen, LY5, Ly-5 glycoprotein, Protein tyrosine phosphatase receptor type C, Protein tyrosine phosphatase receptor type c polypeptide, protein