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Multicellular organisms have high levels of non-coding DNA sequences. The ratio of ncDNA to total genomic DNA (ncDNA/tgDNA) increases with the biological complexity of organisms. 
prokaryotes, 
unicellular eukaryotes, 
the multicellular fungus Neurospora crassa, 
plants, 
non-chordate invertebrates (nematodes, insects), 
Ciona intestinalis (urochordate), 
vertebrates. (Reproduced with permission from Taft and Mattick 2003)
