BLR1/CXCR5 expression in B-cell chronic lymphocytic leukemia.

(A) BLR1/CXCR5 expression in peripheral blood of both CD19-positive B cells (left) and a subset of CD5-positive T cells (right). (B) BLR1/CXCR5 coexpression in the CD19/CD5-positive tumor cells of B-CLL. Flow cytometric detection used the 51505.111 CXCR5 monoclonal antibody with gating on the lymphocyte population by forward and side scatter properties.