Flow cytometry analysis of CXCR shows 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-CXCR receptor mAbs (bold histograms) and control isotype mAbs (dotted histograms). Arrows denote positive cases on the basis of Kolmogorov-Smirnov test.