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Scanning electron micrograph of a multi-cellular breast tumour spheroid (cluster of cells) treated with nanomedicines carrying the anticancer drug doxorubicin. The purple regions show areas of cells dying through a mechanism known as programmed cell death or “apoptosis” while the blue regions represent healthy cells. Diameter of the spheroid is approximately 250 micrometers. (Photo by Khuloud T. Al-Jamal/Izzat Suffian/Wellcome Images)
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