However, markers based on B220, a B-cell specific member of the T200 glycoprotein family, have also been established as B-cell specific markers.2 These are used in CD45R antibodies.10 Other antibodies that can be used to further classify lymphomas, for example, are CD11b, CD11c, CD14, CD21 and CD34.2 The gene discussed is PTPRC; the disease is lymphoma.