Sequence Similarity : Non-homologous sequences (<30%) SEQUENCE SIMILARITY (%) 3g9rA 3k4tA 3g9rA 100 5 3k4tA 11 100 FOLD SIMILARITY (Z-SCORE) 3g9rA 3k4tA 3g9rA 6.3 3.1 3k4tA 0.8 7.4