Sequence Similarity : Non-homologous sequences (<30%) SEQUENCE SIMILARITY (%) 1rbaA 1rbaB 5dleA 1rbaA 100 98 21 1rbaB 98 100 0 5dleA 49 41 100 FOLD SIMILARITY (Z-SCORE) 1rbaA 1rbaB 5dleA 1rbaA 69.2 54.4 0 1rbaB 54.4 66.1 0 5dleA 0 0 26.1