Immunohistochemical findings of the lymph node biopsy from an ATL case.

The serial sections of lymph node biopsy specimens were stained with control mouse IgG (A) and 56-2A4 mAb (B). (C) To ensure the specificity of 56-2A4 mAb, blocking was done with MMP-9. The tissue sections were stained with 56-2A4 mAb after incubation with MMP-9 (C). Sections were counterstained with methyl green; original magnification × 400. Mononuclear cells infiltrating are clearly positive for MMP-9 (B).