Confocal photomicrograph for hCNT3 in CLL cells. (A,C) Background staining of CLL cells reacted with an IgM isotype control antibody shown in phase contrast (A) or fluorescent confocal microscopy (C). (B,D) CLL cells reacted with hCNT3 monoclonal antibody shown in phase contrast (B) or fluorescent confocal microscopy (D) illustrating intense cytoplasmic staining by this antibody.