Sequence Similarity : Non-homologous sequences (<30%) SEQUENCE SIMILARITY (%) 3k7yA 4geqA 4geqB 3k7yA 100 31 0 4geqA 8 100 0 4geqB 2 6 100 FOLD SIMILARITY (Z-SCORE) 3k7yA 4geqA 4geqB 3k7yA 68.9 0 0 4geqA 0 20.5 0 4geqB 0.3 3.2 12.8