Deparaffinized and rehydrated sections were used for immunohistochemistry. Organ sections were immersed in 10 mM sodium citrate, pH 6.0, and microwaved for antigen retrieval and stained on a BenchMark ULTRA system fully automated instrument (Roche) with an antibody directed against CD3 (2GV6; Ventana), CD4 (SP35; Ventana), CD8 (SP57; Ventana), CD15 (MMA; Ventana) CD26 (ab28340; Abcam), CD183 (1C6/CXCR3; BD Pharmigen), CD61 (ZfZ; Leica), CD20 (LZ6; Ventana), and CD68 (KP-1; Ventana).