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Integraeon in c onc disrupeon of c onc abnormal c onc

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Unformatted text preview: are implicated in the conversion of a normal cell into a tumor cell, i.e. a cell that has acquired immortality, characterized by uncontrolled replicaEon. This process is called transformaEon. •  Both DNA and RNA viruses are known to cause tumors in animals and in humans. In most cases, other factors are also involved. Viruses are not the only cause of cancer. •  Four different mechanisms: 1.  2.  3.  4.  TransducEon. InserEon of a strong promoter. InacEvaEon of a tumor suppressor gene Expression of a viral protein that induces transformaEon (DNA virus) EsEmated that 15- 20% of all human cancers are...
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