Sequence Similarity : Non-homologous sequences (<30%) SEQUENCE SIMILARITY (%) 5tw1A 5vkoA 5vkoB 5tw1A 100 35 0 5vkoA 40 100 0 5vkoB 0 0 0 FOLD SIMILARITY (Z-SCORE) 5tw1A 5vkoA 5vkoB 5tw1A 34.2 1.8 0 5vkoA 0.2 33 0 5vkoB 0 0 0