The growth of certain cancers may be triggered by junk DNA, say scientists. They have found that it can cause the spread of Hodgkin's lymphoma, a blood disorder, and they believe the same may be true with other forms of cancer. Junk DNA is that which has not formed genes and it accounts for almost half of an individual's genetic material, built up over millions of years through evolution. Originating from viruses, it is normally made inactive when an embryo develops in the womb. (source: mirror.co.uk)
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