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. 2015 Feb 19;16:52. doi: 10.1186/s12859-015-0480-9

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© de Oliveira et al.; licensee BioMed Central. 2015

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Canonical genetic code and hypothetical codes in a gray scale according to the respective polar requirement of the amino acids, when M _st is used, in the experiment with polar requirement and hydropathy index.