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. 2007 Jul 3;97(3):322–326. doi: 10.1038/sj.bjc.6603864

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Copyright © 2007 Cancer Research UK

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C219 staining (magnification × 400) of a rat brain. Capillary endothelium stains brown in the non-irradiated hemisphere (A), revealing the presence of P-gp. In the irradiated hemisphere (B), after five fractions of 4 Gy, no P-gp is present in the capillary endothelium. Arrows mark capillaries.