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Fig. 5 | BMC Evolutionary Biology

Fig. 5

From: Assessing parallel gene histories in viral genomes

Fig. 5

a,b Tree length (number of substitution per site) for PVs. a Displays nucleotide tree length with the contribution of the first, second and third codon position in dark grey, white and light grey respectively. b Represents the amino acid tree length. c,d Biplot of the principal coordinates analysis (PCoA) using the four variables TreeComp1_nt, TreeComp2_nt, TreeComp1_aa, TreeComp2_aa (see Additional file 5: Table S3) for PV. The first principal component is represented in the x-axis, and the second principal component is represented in the y-axis. Percentage values in the axes show the percentage of variation explained by either components. e Percentage of sites under positive (dark grey), neutral (white) and purifing selection (light grey) for PVs (left scale). The solid black line represents the Huber M-estimation of ω (±median absolute deviation) of all position for each gene and the concatenated (right scale)

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