Sequence Similarity : Non-homologous sequences (<30%) SEQUENCE SIMILARITY (%) 3pqhA 3qr7A 4ru3A 3pqhA 100 35 19 3qr7A 25 100 10 4ru3A 30 82 100 FOLD SIMILARITY (Z-SCORE) 3pqhA 3qr7A 4ru3A 3pqhA 15.1 0 2 3qr7A 0 13 2.3 4ru3A 0 2.7 23.7