Flow cytometry and immunohistochemistry results demonstrate CD1c antigen expression in a variety of B-cell subgroups, including mature and immature B-cell lines, as well as chronic lymphocytic leukemia (CLL) and hairy cell leukemia (HCL) (Smith, Thomas & Bodmer, 1988). The gene discussed is CD1C; the disease is B-cell chronic lymphocytic leukemia.