Sequence Similarity : Non-homologous sequences (<30%) SEQUENCE SIMILARITY (%) 2dreA 2dreC 6g1uA 2dreA 100 99 19 2dreC 99 100 49 6g1uA 24 49 100 FOLD SIMILARITY (Z-SCORE) 2dreA 2dreC 6g1uA 2dreA 37.3 32.5 0 2dreC 32.5 38.2 0 6g1uA 0 0 77.2