Table 1.
Number of conserved amino acids among the repeats and their codon usages
| Amino acid (favored codon) | Central region
|
Boundary region
|
||||
|---|---|---|---|---|---|---|
| Total | With identical codon | % | Total | With identical codon | % | |
| I (AUC) | 6 | 4 (AUC 4) | 67 | 3 | 0 | 0 |
| P (CCC) | 10 | 8 (CCC 4, CCG 2, CCU 1, CCA 1) | 80 | 12 | 1 (CCC 1) | 8 |
| V (GUC) | 8 | 8 (GUC 5, GUG 3) | 100 | 6 | 1 (GUC 1) | 17 |
| G(GGC) | 19 | 15 (GGC 14, GGG 1) | 79 | 17 | 8 (GGC 8) | 47 |
| A (GCC) | 10 | 8 (GCC 5, GCG 2, GCU 1) | 80 | 7 | 2 (GCC 2) | 29 |
| S (UCC) | 5 | 5 (UCC 4, UCU 1) | 100 | 4 | 2 (UCC 1, AGC 1) | 50 |
| R (CGC) | 6 | 5 (CGC 3, CGG 1, CGU 1) | 83 | 6 | 3 (CGC 3) | 50 |
| L (CUC) | 11 | 7 (CUC 4, CUG 3) | 64 | 13 | 2 (CUC 1, CUG 1) | 15 |
| All | 130 | 106 | 82 | 126 | 53 | 42 |
Synonymous substitution constraint in the central region of the repeats. The conserved amino acids are defined as those amino acids that are identical in the three repeats. The total number of conserved amino acids (130 for the central region and 126 for the boundary region) do not include methionine and tryptophan. Amino acids that use 2-fold degenerate codons are not shown but are included in the calculation.