Sequence Similarity : Non-homologous sequences (<30%) SEQUENCE SIMILARITY (%) 3ii9C 4ttwA 5trbA 3ii9C 100 89 0 4ttwA 42 100 0 5trbA 0 0 100 FOLD SIMILARITY (Z-SCORE) 3ii9C 4ttwA 5trbA 3ii9C 70.4 0 0 4ttwA 0 27.9 0 5trbA 0 0 15.8