Sequence Similarity : Non-homologous sequences (<30%) SEQUENCE SIMILARITY (%) 4giwA 4giwB 5vr2A 4giwA 100 97 0 4giwB 97 100 0 5vr2A 8 8 100 FOLD SIMILARITY (Z-SCORE) 4giwA 4giwB 5vr2A 4giwA 35.2 28.6 0 4giwB 28.6 35.1 0 5vr2A 0.1 0.2 7