Sequence Similarity : Non-homologous sequences (<30%) SEQUENCE SIMILARITY (%) 1x75C 1x75D 5ucsA 1x75C 100 95 3 1x75D 95 100 0 5ucsA 10 0 100 FOLD SIMILARITY (Z-SCORE) 1x75C 1x75D 5ucsA 1x75C 23.6 18.5 0 1x75D 18.5 22.4 0 5ucsA 0 0 54.3