Sequence Similarity : Non-homologous sequences (<30%) SEQUENCE SIMILARITY (%) 3f4lA 3ii9A 4q2lA 3f4lA 100 72 17 3ii9A 65 100 0 4q2lA 3 0 100 FOLD SIMILARITY (Z-SCORE) 3f4lA 3ii9A 4q2lA 3f4lA 57.5 0 0 3ii9A 0 69.8 0 4q2lA 0 0.2 16.5