Sequence Similarity : Non-homologous sequences (<30%) SEQUENCE SIMILARITY (%) 1sedA 1sedB 3kpeA 1sedA 100 98 0 1sedB 98 100 0 3kpeA 3 3 100 FOLD SIMILARITY (Z-SCORE) 1sedA 1sedB 3kpeA 1sedA 21.8 21.2 0 1sedB 21.2 22 0 3kpeA 0.7 0.2 6.9