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Transplanted human cells express the chemokine receptor CXCR4. Shown are confocal images from lesioned brains of human cells labeled with the human-specific antibody SC121 (green) and an anti-CXCR4 antibody (red); nuclei are stained with Hoechst (blue). (A) Representative image of migrating human cells. (B) Representative image of human cells at the lesion border. An asterisk indicates double-labeled cells; arrowhead indicates human cells that did not express CXCR4.
