CD200R1 bands were detected in the immunoprecipitate from cells incubated with CLL supernatants (Fig 6d, lane 4) or Hek-hCD200 supernatant (Fig 6d, lane 3), but not in cells stimulated with sCD200- control supernatants (Fig 6d, lane 2)-data shown are representative of one of 3 similar studies. This evidence concerns the gene CD200R1 and B-cell chronic lymphocytic leukemia.