According to a report issued by Australian forensic scientists, humans are leaving traces of their DNA on everything they touch. Scientists from the Victoria Forensic Science Center in Victoria, Australia, reported in the journal Nature, that they had found DNA on coffee mugs, pens, keys, and assorted everyday items, then traced it back to its various "owners." While the scientists were unclear as to the exact source of this "naked" DNA, or DNA that exists outside of cells, they suggested that DNA might have escaped from dying cells and remained on the surface of the skin. Previously, DNA had been recovered from blood and other body fluids and apparently, in the case of accused "Unabomber" Theodore Kaczynski, from traces of saliva collected from licked stamps. Police have used DNA as evidence in cases of murder, robbery, extortion and other crimes. The researchers found that people can pick up other people's DNA on their hands, which raised the possibility that DNA found at a crime scene might not belong to the criminal.
It is implied in the passage that DNA ------ .
is only formed in dead cells
has no real use except to the police force
is usually found on the outside of the skin
does not survive very long outside the cells
is unique to an individual
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