Sequence Similarity : Non-homologous sequences (<30%) SEQUENCE SIMILARITY (%) 4krwA 4omzA 4omzB 4krwA 100 0 0 4omzA 0 100 99 4omzB 0 99 100 FOLD SIMILARITY (Z-SCORE) 4krwA 4omzA 4omzB 4krwA 14.8 0 0 4omzA 0 20.5 18.5 4omzB 0 18.5 20.2