We have A new “Material and Method” section has been added. Such issues as statistical resampling tests (bootstrap and jackknife), calibration of branch length, the meaning and choice of the peptide length K, etc. , were discussed in the new section. Figures 1 and 2 were combined to a new Figure 1; Figures 3 and 4 were combined to become a new Figure 2. Figure captions were made more detailed. The whole text was checked for language flaws and many places were rephrased.
Perhaps an additional discussion point would be the advantages of using CVtree approach with regular concatenated proteins.