Sequence Similarity : Non-homologous sequences (<30%) SEQUENCE SIMILARITY (%) 3bu2A 4uoxC 4uoxD 3bu2A 100 27 20 4uoxC 33 100 99 4uoxD 24 99 100 FOLD SIMILARITY (Z-SCORE) 3bu2A 4uoxC 4uoxD 3bu2A 30.9 0 0 4uoxC 0 73.6 70.2 4uoxD 0 70.2 73.6