Sequence Similarity : Non-homologous sequences (<30%) SEQUENCE SIMILARITY (%) 2f1fA 2xpxA 2xpxB 2f1fA 100 100 0 2xpxA 0 100 0 2xpxB 0 0 0 FOLD SIMILARITY (Z-SCORE) 2f1fA 2xpxA 2xpxB 2f1fA 28.1 0 0 2xpxA 0 33.6 0 2xpxB 0 0 0