Immunohistochemistry for TLR9 and CXCR4 in LSG of pSS and healthy controls. (A, E) Infiltrating lymphocytes in LSG of pSS positively stained for TLR9 (200× and 400× magnification); (B, F) glandular epithelial cells from control were negative (200× and 400× magnification); (C, G) infiltrating lymphocytes and adjacent glandular epithelial cells in LSG of pSS were positively stained for CXCR4 (200× and 400× magnification). (D, H) Glandular epithelial cells from control were negative (200× and 400× magnification). (TIF 28419 kb