Immunoreactivity for CD100 in a case of small non-cleaved (Burkitt-like) B-cell lymphoma. A: Representative neoplastic tissue fixed in 10% buffered formaldehyde, paraffin embedded, sectioned, and stained with H&E. B: CD100 immunoperoxidase staining of frozen neoplastic tissue. Intermediate-size neoplastic cells exhibit low to moderate, uniform surface staining for CD100. Scattered, reactive T cells are strongly immunoreactive for CD100.