Sequence Similarity : Non-homologous sequences (<30%) SEQUENCE SIMILARITY (%) 3eusA 3eusB 5ntdI 3eusA 100 91 40 3eusB 91 100 18 5ntdI 0 0 100 FOLD SIMILARITY (Z-SCORE) 3eusA 3eusB 5ntdI 3eusA 20.7 17 0 3eusB 17 19.3 0 5ntdI 0 0 71.5