Flow cytometry analysis of CCR shows a distinct pattern of expression of these receptors among different B-NHLs. The histograms were obtained from a representative healthy subject and from malignant B lymphocytes recovered from representative patients with different types of NHL. The analysis was performed by flow cytometry on purified B lymphocytes following incubation with anti-CCR receptor mAb (bold histograms) and control isotype mAb (dotted histograms). Arrows denote positive cases on the basis of the Kolmogorov-Smirnov test.