Figure 3A displays a section of an MSG tissue derived from an SS-nL patient stained with isotype control. Lp-PLA2 protein expression was found mainly within lymphocytic infiltrates including tissue macrophages (the major Lp-PLA2–producing cell type) and lower expression was reported in salivary gland epithelial cells (Figures 3B–F). Of interest, immunohistochemical detection of Lp-PLA2 was detected in a lymph node derived from a non-SS patient with marginal zone lymphoma (Figures 3G, H). Here, PLA2G7 is linked to marginal zone lymphoma.