Immunofluorescent staining of Merkel cell carcinoma tumor tissue illustrating expression of CD200 (green) on the surface of tumor cells. CD200 plays a role in immunosuppression. Endothelial marker CD31 (red) highlights blood vessels. Merkel cell carcinoma is a rare and aggressive skin cancer.
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Photo credit: © NIH / IMAGE POINT FR / BSIP / Alamy / Afripics
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