Sequence Similarity : Non-homologous sequences (<30%) SEQUENCE SIMILARITY (%) 2qksA 3ldcA 3lutB 2qksA 100 20 21 3ldcA 19 100 15 3lutB 52 17 100 FOLD SIMILARITY (Z-SCORE) 2qksA 3ldcA 3lutB 2qksA 38.4 6.9 0 3ldcA 8.9 19.2 5.7 3lutB 2.5 2.7 39.3