Sequence Similarity : Homologous sequences (>30%) SEQUENCE SIMILARITY (%) 3ptyA 5u55A 5u55D 3ptyA 100 91 91 5u55A 91 100 99 5u55D 91 99 100 FOLD SIMILARITY (Z-SCORE) 3ptyA 5u55A 5u55D 3ptyA 47.8 0 0 5u55A 0 26.6 25.3 5u55D 0 25.3 26.6