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Presence of male fetal cells expressing the endothelial marker CD31 in melanoma of women pregnant with male children. The phenotype of fetal cells was identified by combination of FISH and immunostaining for CD31. A: Photomicrograph shows a group of male fetal cells expressing the vascular marker CD31 (white arrow). B: This group of male CD31+ cells was located in the tumor (black arrow, H&E staining). Original magnifications: ×1000 (A); ×100 (B).
