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Immunoreactivity of CD4+ and CD8+ infiltrating lymphocytes in group I and group III histiocytoma. Slightly more CD4+ cells in group I (a, b). Dominance of CD8+ cells in group III (c, d). Frozen sections, ABC method, bar=100 µm. (a) CD4/group I; (b) CD8/group I; (c) CD4/group III; (d) CD8/group III.
