Sequence Similarity : Non-homologous sequences (<30%) SEQUENCE SIMILARITY (%) 2xgfA 4usxA 4zsxA 5u02A 2xgfA 100 57 0 81 4usxA 0 100 74 67 4zsxA 0 78 100 40 5u02A 0 60 37 100 FOLD SIMILARITY (Z-SCORE) 2xgfA 4usxA 4zsxA 5u02A 2xgfA 17.8 0 0 0 4usxA 0 21.1 0 0 4zsxA 0 0 45.2 0.3 5u02A 0 0 0.4 48.7