Sequence Similarity : Non-homologous sequences (<30%) SEQUENCE SIMILARITY (%) 1sffA 2veqA 4oo2A 1sffA 100 0 74 2veqA 100 100 100 4oo2A 100 100 100 FOLD SIMILARITY (Z-SCORE) 1sffA 2veqA 4oo2A 1sffA 75.7 0 0 2veqA 0.9 61.2 1.8 4oo2A 1.7 1.3 68