Sequence Similarity : Non-homologous sequences (<30%) SEQUENCE SIMILARITY (%) 2oikA 3isaA 3isaC 2oikA 100 22 24 3isaA 20 100 99 3isaC 20 99 100 FOLD SIMILARITY (Z-SCORE) 2oikA 3isaA 3isaC 2oikA 29.5 0 0 3isaA 0 46.3 43.8 3isaC 0 43.8 46.1