Additional file 4.

CUB commitment and variation. The 64 codons in 113 species were sorted according to the size and +/- orientation of their CUB. Some manual adjustments were made to segregate the data into four approximately symmetrical subgroups (corresponding to the color codes).

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Biro Theoretical Biology and Medical Modelling 2008 5:16   doi:10.1186/1742-4682-5-16