Sequence Similarity : Non-homologous sequences (<30%) SEQUENCE SIMILARITY (%) 3c9uA 3c9uB 5al6A 3c9uA 100 99 0 3c9uB 99 100 0 5al6A 3 0 100 FOLD SIMILARITY (Z-SCORE) 3c9uA 3c9uB 5al6A 3c9uA 54.3 51.8 0 3c9uB 51.8 54.3 0 5al6A 0 0 6.5