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Point mutation, DNA amplification, and chromosomal alterations (like translocations) are three examples of mutations that can turn proto-oncogenes into oncogenes. (Illustration by Argosy Publishing.)
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![An image showing the division of cancer cells (left and right) and two healthy white blood cells (above and below). In normal cells, cell division is balanced by cell death, but cancerous cells continue to divide and accumulate, damaging nearby tissues. [Nibsc/Photo Researchers, Inc. Reproduced by permission.]](/images/gale/big/nwaz_01_img0045.jpg)
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