Figure 5. Number and frequency of tandem repeats of 20 individual amino acids in five proteomes and orthologous protein pools.

(A) Amino acid repeats (≥3 amino acids) were estimated as triplet units. For repeats longer than 3 amino acids, the number of triplet units was assigned as the whole number from division of the consecutive amino acids with 3, as was done for PPP. (B) The frequency of each amino acid triplet unit was determined by division of the total number of triplet units with the total number of amino acids in each proteome listed in Table 2. (C) The frequencies of tandem repeats of Glu, Pro and Leu in four orthologous protein pools used in Fig. 4.