We confirmed that sCD200 immunoprecipitated from PMA-stimulated CLL or serum-starved Hek-hCD200 supernatants using 1B9 antibody was recognized only by anti-serum against CD200v+c (as a ~47kd band, Fig 6c, upper panel), but not by the anti-c-tail serum (Fig 6c, lower panel), indicating that sCD200 from both sources lacked the cytoplasmic tail. This evidence concerns the gene EPHA3 and B-cell chronic lymphocytic leukemia.