Figure 4.

Comparison between the percentage of differences observed in the transcription and ribosomal datasets for each couple of taxa. The x-axis represents the percentage of amino-acid differences observed between two taxa for the concatenated transcription dataset. The y-axis represents the percentage of amino-acid differences observed between two taxa for the concatenated ribosomal dataset. Circles show for each pair of taxa the comparison between the observed percentage of differences for the concatenated transcription and ribosomal datasets. The majority of circles are localized close to the diagonal indicating a strong correlation (R = 0.88) between the differences observed into the two concatenated datasets. White circles represent the comparisons of Methanopyrus kandleri with other taxa.