Sequence Similarity : Non-homologous sequences (<30%) SEQUENCE SIMILARITY (%) 2xdjC 3g9rA 2xdjC 100 10 3g9rA 10 100 FOLD SIMILARITY (Z-SCORE) 2xdjC 3g9rA 2xdjC 7.7 4.3 3g9rA 4.3 6.3