Immunohistochemical pictures of frozen tissue sections, double-stained for CD4 (brown) and sialoadhesin (blue) (A and B) and for CD4 (brown) and CD8 (blue) (C and D) in spleens of normal control mice (A and C) or ESb-MP tumor-bearing mice (d28) 5 days after ADI treatment (B and D) (original magnification × 160).