J.W. SHULER / SCIENCE PHOTO LIBRARY J.W. SHULER / SCIENCE PHOTO LIBRARY
Cancer cells. Polarised light micrograph of cancerous liver cells. The cell in the centre is undergoing cell division (mitosis). It is in the prometaphase, the phase when the nuclear envelope breaks and the microtubules (green) can attach themselves to condensed chromosomes (blue). Actin microfilaments (red) make up the cell's cytoskeleton. The cancer has spread to the liver, a process known as metastasis. Secondary liver cancer is incurable, but life can be prolonged with anti-cancer drugs.
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