RESULTS
The DNA and amino acid sequences were obtained for 949 modules from 129 PKSs. Eight multiple protein sequence alignments (α-δ modules ± DD) were generated with ESPript to show the locations of known secondary structures [1, 3, 12-15] (Supplementary Figures 1-8). Tandem repeats were detected at the DNA level, and the amino acids encoded by them were examined on the protein level.