CXCL16 and common variable immunodeficiency: In light of the role of CXCL16 in modulating cellular responses to CpG, and of the demonstration that B lymphocytes from CVID patients have an impaired response to CpG, we have assessed the expression of CXCL16 on the surface of B lymphocytes from CVID patients and correlated such expression with CVID B cell responses to CpG.