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This is a large model of DNA, about 12cm long. It is represented by VDW spheres coloured according to atom type. DNA encodes genetic information in a chain of nucleotides. This structure includes a short DNA double helix sixteen nucleotides long. PDB: 3BSE http://www.rcsb.org/pdb/explore/explore.do?structureId=3bse For a smaller DNA model see http://shpws.me/pm0l