Scanning electron micrograph of a cluster of breast cancer cells showing visual evidence of programmed cell death (apoptosis) in yellow. Each cell is 15 micrometers across.
Image B0006422. 2006 Collection: Wellcome Images Copyrighted work available under Creative Commons by-nc-nd 2.0 UK: England & Wales, see http://creativecommons.org/licenses/by-nc-nd/2.0/uk/
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