Washington: Scientists have made a medical breakthrough which may help bring new insights on how genes are activated.Roughly 3 metres of DNA is tightly folded into the nucleus of every cell in our body. This folding allows some genes to be `expressed`, or activated, while excluding others.Dr Tim Mercer and Professor John Mattick from Sydney`s Garvan Institute of Medical Research and Professor John Stamatoyannopoulos from Seattle`s University of Washington analysed the genome`s 3D structure, at high resolution.Genes are made up of `exons` and `introns` - the former being the sequences that code for protein and are expressed, and the latter being stretches of noncoding DNA in-between.
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