Cancer: cell division out of control
Why?
Cancer happens when mutations break the controls on the cell cycle, so cells divide without stopping and form a tumour.
One cell ignores the red checkpoint light and divides again and again, piling up into a lump while normal neighbours stop.
Press the button to watch one cell lose its controls and form a tumour.
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Tumour cells break away, enter a blood vessel and travel to start a new tumour elsewhere.
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