Sequence Similarity : Non-homologous sequences (<30%) SEQUENCE SIMILARITY (%) 2zxxA 2zxxB 6eysA 2zxxA 100 9 0 2zxxB 9 100 0 6eysA 0 0 100 FOLD SIMILARITY (Z-SCORE) 2zxxA 2zxxB 6eysA 2zxxA 7.9 5.4 0 2zxxB 5.3 8.6 0 6eysA 0 0 60.3