Fig. 1. Histological sections of dermatofibroma stained with antibodies against (A, B) leukocyte-specific protein 1 (LSP1), (C, D) factor XIIIa (FXIIIa), and (E, F) CD68. Expression of LSP1 and FXIIIa was observed in both (A, C) cellular lesions and (B, D) fibrous lesions. In contrast, immunoreactivity of CD68 was stronger in (E) cellular lesions than (F) fibrous lesions (A~F: ×200).