Number of base substitutions per site (p-distance) from sequences belonging to CR1 elements. See Figure 3 for detailed information. Lines a–d represent the p-distances among different regions (ORF1, ORF2, RT, 3′-conserved region) of full-length sequences; lines e–h represent the p-distances from truncated sequences belonging to the same families analyzed in lines a–d (truncated I); and lines i–l represent distances from truncated sequences from families were no full-length sequences were identified (truncated II). The mean p-distances and standard deviation are shown on top of each boxplot. Kruskal-Wallis test: p-value < 0.001. Ad hoc, Tukey non-parametric test: for full length sequences: a–b**, a–c**, d–c*; the rest are not significant. For ORF1 comparisons: a–e***; a–i***; e–I = ns; for ORF2: b–f = *; b–j = *; f–j = ns; for RT: c–g = **; c–k = **; g–k = *; for 3′ conserved region: d–h = ***; d–l = ***; h–l = ***. p-value: ns = not significant; * < 0.05; ** < 0.005, *** < 0.0001.