CD44 and B-cell chronic lymphocytic leukemia: On the other hand, the N-linked glycosylated CD44 variant (CD44v6) forms high-avidity interaction with HA under the stimulation of the CD40 ligand, thus producing an adhesive force to stop CLL mobility, thus retaining CLL cells in specialized compartments of lymph node where they would encounter intensive survival and proliferation-inducing signals542.