Sequence Similarity : Non-homologous sequences (<30%) SEQUENCE SIMILARITY (%) 2z2tA 3k4tA 2z2tA 100 6 3k4tA 7 100 FOLD SIMILARITY (Z-SCORE) 2z2tA 3k4tA 2z2tA 5.7 2 3k4tA 0 7.4