BY5.4 Carcinogens and Cancer

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  • substances that cause cancer
  • they affect the DNA in the cells and cause mutations
  • mutations occur in the body's cells and are recognised as foreign by the immune system and are destroyed
  • occasionally mutuatuons affect the regulation of cell division and cancer starts like this
  • an oncogene is a mutated gene that causes cancer
  • if such a cell escapes immune attack it produces a lump…


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