Sequence Similarity : Non-homologous sequences (<30%) SEQUENCE SIMILARITY (%) 3i51A 5y3aA 5y3aE 3i51A 100 0 4 5y3aA 0 100 4 5y3aE 40 0 100 FOLD SIMILARITY (Z-SCORE) 3i51A 5y3aA 5y3aE 3i51A 40.9 0 0 5y3aA 0.2 6.9 0 5y3aE 0 0 21.1