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. 2012 May 14;40(16):e126. doi: 10.1093/nar/gks406

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© The Author(s) 2012. Published by Oxford University Press.

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0), which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Figure 6. — Comparison of the abundance of phage words in bacteria (triangles) and phage genomes (x). (A) The Shannon’s index (H) versus the frequency (F) of the presence of phage words for 600 complete phage genomes and 400 randomly chosen complete bacterial genomes. Both H and F are very small for bacterial genomes compared to phage genomes. The relationship between H and F for phages is F = 8.57 H + 0.047 with a regression coefficient R²= 0.995 and for bacterial genome the relation is F = 5.85 H + 0.014 with a regression coefficient R²= 0.993. (B) The ratio of the frequency and Shannon’s index, i.e. F/H for 600 complete phage genomes and 400 randomly chosen complete bacterial genomes. There is a statistically significant difference in F/H (abundance of phage words) between phages and bacteria.