Sequence Similarity : Non-homologous sequences (<30%) SEQUENCE SIMILARITY (%) 3hrnA 5z0wE 3hrnA 100 8 5z0wE 3 100 FOLD SIMILARITY (Z-SCORE) 3hrnA 5z0wE 3hrnA 7.5 3.5 5z0wE 3.5 5.7