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. 2007 Jan 23;8:21. doi: 10.1186/1471-2105-8-21

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Copyright © 2007 Thomas et al; licensee BioMed Central Ltd.

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 cited.

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Panel A: Purine skew for the complete genome of Ectromelia virus strain Moscow (NC_004105.1). Gene annotations for this genome are show below the skew plot; genes are shown as red and blue bars to illustrate transcription towards the left and right ends of the genome, respectively. Green highlight shows 4 genes that are transcribed rightwards, which are flanked by genes transcribed leftwards. Panel B: Purine skew for the region highlighted in Panel A. Panel C: Plot of transcription orientation for Ectromelia virus genes. For genes transcribed to the left and right, the plot moves down and up, respectively. Green highlight as in Panel A.